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• triple duplicate acknowledgement in TCP congestion control

  - by Salvador Dali

  If this doesn't belong here, please tell me where is an appropriate place for such question. I am trying to understand ideas behind tcp congestion control mechanisms, and I am failing to understand why we need triple duplicate acknowledgement to trigger window change. In my opinion, double duplicate acknowledgement will be enough to get that the previous package is lost. So why we need the third ack?

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• How to control Excel VBE Find Dialog window position

  - by Herb

  In the Excel VBE, the Find Dialog box (CTRL-F) pops up half off screen at the bottom of screen. How do I control the Find window so it positions itself higher up on the screen ?

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• Recommendations or advice for shared computer control

  - by Telemachus

  Basic scenario: we are a school (overwhelmingly Mac, some Windows machines via BootCamp), and we are considering using DeepFreeze to guard the state of our shared machines. We have roughly 250 machines that are either shared laptops (which move around quite a bit) or common desktops in public spaces. Obviously, we spend a lot of time maintaining the machines and trying to reverse the inevitable drift as people make changes to the computers. We would like to control the integrity of the build we initially put onto the machines without handcuffing users and especially without using Mac's Parental Control software. (We've had nothing but bad experiences with it.) We've been testing DeepFreeze, and so far it's very impressive. But I'm curious to hear if people who have used DeepFreeze or any similar software have any advice or tips. To get things started, I will post my own pros and cons. Pros: The state of the machine is frozen in our chosen state. All changes made to the machine after that disappear upon restart. (This frozen state really appears to cover everything. I have yet to do something to a test machine that isn't instantly healed.) Tons of trivial but time-consuming maintenance is gone in an instant. Also, lots of not-so-trivial breakage should be avoided. There are good options, however, that allow you to create storage spaces either globally or per user. (Otherwise, stored files disappear upon reboot. For some machines, this is a good option itself. Simply warn people: save externally or else; this machine is a kiosk, not your storage space.) Cons: Anytime we actually need to make a change (upgrade basic software, add a printer or an airport permanently, add new software), the process is a bit more complex. Reboot into a special mode (thaw state), make changes, reboot back into frozen mode. If (when?) we forget this, we will end up making changes that disappear after the next reboot. Users will forget to save files correctly (in the right place or externally), and we will have loud, unpleasant conversations explaining that we can't recover the document they worked on all afternoon yesterday. The machine rebooted. The file is gone. These are my initial thoughts, but I would love to hear from other people who have experience with DeepFreeze or any similar software. What should we be careful about? Do the pros outweigh the cons? What gains or problems am I not seeing? Thanks.

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• To control decibels in speakers by Ubuntu

  - by Masi

  I need to load the module pcspkr to Linux kernel often by sudo modprobe pcspkr. It sometimes happens that something goes totally wrong such that I cannot stand the amount of decibels in my speakers. I would like to control the amount of decibels in my speakers and to have a visual speaker in my top panel which indicates the amount of decibels in my computer at each given time How can you solve at least one of the problems?

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• How to control VPN client via commandline

  - by Michael Caron

  There must be a way to control the built-in VPN client in OS-X Snow Leopard, I simply can't find documentation about it. I want to be able to connect and disconnect while I'm ssh'd into my box remotely. Does anyone know how to do that?

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• Install Windows control panel applet in Wine

  - by Scribble Master

  I want to add the bthprops.cpl dll (The bluetooth control panel applet) to my wine install under Ubuntu 10.04 since it is required for Dolphin Emulator. http://www.dolphin-emulator.com/ I copied the file from my windows install into the System32 folder in .wine and into the folder where the application I am trying to run is, but wine still fails to load it. Is there anything else I need to do to make the dll accessible for wine programs? (Please don't suggest the native linux Version of Dolphin as a fix - it is not working for me)

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• Control Panel not showing

  - by Luke

  Whenever I select 'Control Panel' from my taskbar all it comes up with is an open window with nothing in it. I'm running Vista and have recently turned of UAC (if this makes a difference). Can anybody help me to change this?

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• Windows 7 sound control is not flexible.

  - by jon

  I would like to be able to listen to music on both of two audio output devices, but Windows 7 seems to only allow me to select one or the other as the Default device. When device A is the Default device, device B is muted; and vice versa. This seems to be stunningly inflexible. Since Windows 7 is unable to do this, can anyone recommend any add-on software that would control the hardware more flexibly and thoughtfully?

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• Control startup window size of a program

  - by Phenom

  There is a particular program that I use that whenever it starts up, its window is always too big. I always have to resize it to make it smaller. Is there a way I can control the size of the window when it starts up?

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• Control Key for Home & End on Command Line in Terminal on Mac OS X

  - by ydfeed

  What are the control keys to move the cursor to the beginning and end of the command line? The Home and End keys don't work in Terminal on Mac OS X.

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• Apache2: Limit simultaneous requests & throttle bandwidth per IP/client?

  - by xentek

  I want to limit simultaneous requests & throttle bandwidth per IP/Client on a single apache vhost. In other words, I want to ensure that this site, which hosts large media files, doesn't get hammered by someone trying to download everything all at once (just happened the other night). I'd like to limit the outgoing transfer speed overall for this site, as well as limit the number of connections a single IP can make to the server to a sane default (i.e. within normal browser limits for multiple requests so page loads aren't effected too much). Bonus points if I can actually scope it to file types (i.e. leave web files alone, but apply these rules to just the media files). We're running Ubuntu 9.04 on all the servers, and have two apache/php servers being load balanced via Round Robin by a squid proxy server. MySQL is running on its own box as well. We've got plenty of bandwidth to give them, so I don't really want overall caps, but just want to throttle the amount of memory/CPU it takes to serve this site. There other sites on these servers that we don't want to apply these rules too, just want to keep this one from hogging all the resources. Let me know if you need more info! Thanks in advance for your suggestions!

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• Application that will identify percentage of your system disk bandwidth used on a user-application by user-application basis?

  - by Warren P

  I always (subjectively) feel my computer is far too slow (however fast it is), and so I'm always looking for ways to measure and understand what my computer is actually doing, that is making it seem "slow" to me. It has been my observation that my software-developer workload is most often disk-bound (I am waiting for Disk I/O) more than CPU bound. What has made it worse, is that I am using a corporate PC that has in-memory active-scanning anti-virus software that I do not have control over, and also some IT department mandated services that seem to suck up a lot of available hard-disk bandwidth. The best tool I have seen (in Windows 7) is the Resource Monitor which I usually acess from the button in the task Manager. The disk IO page, however, seems to label Disk Activity at a very low level (for example, showing the Volume Shadow Storage, which is flushing information obviously written by something ELSE other than VSS itself, and then writes to Pagefile.sys, which are obviously due to Virtual Memory faults in some application). What I would like to know is if a utility exists that can add up all direct disk input and output by user-level process, or find the process or service that caused VM or VSS activity. In that way, I hope, you could establish a real idea of how much of your computer's precious disk subsystem bandwidth is attributable to a particular application. here's a scenario: MyApp.exe writes 100k/s and reads 100k/s directly. VSS ends up writing another 100k/s. pagefaults caused inside MyApp.exe cause another 100k/s of writes. So the total "cost" of MyApp.exe running, during a period of time (let's say 1 second) is 400k/s, whereas you can only directly observe half of that, in Resource Monitor. Is there a smarter disk-IO watching piece of software I can use?

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• Throughput and why do ISPs sell too much bandwidth?

  - by jonescb

  I hope the question made sense how I worded it. :) I've been wondering, maximum theoretical bandwidth is measured as RWIN/RTT (Window size / round trip time) Source 1 and Souce 2 So if a major city only 100 miles away gives me a ping of 50ms, and I have the default 64kb TCP window size then my maximum throughput will be 12.5Mb/s. Everything further away would give me a higher ping and therefore a lower throughput. Is there any reason to buy something like FiOS with a 50Mb/s or greater connection? Will you ever be able to reach that kind of speed? I know you can increase the TCP window size to increase throughput, but it has to be at both ends which is a deal breaker because you can't control the server. I'm assuming other network protocols like UDP aren't quite as affected by latency as TCP is, but how much of overall network traffic does non-TCP make up vs TCP. Am I just misguided about how throughput works? But if the above is correct, then why should a consumer like me buy way more bandwidth than can be realistically used. Maybe the only reason is for downloading multiple things at once, or one thing from multiple servers/peers?

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• Books about Advanced WPF control building

  - by Carlo

  Hello. I'm really interested in learning really advanced features of WPF to learn how to create advanced controls, but apparently I'm running out of resources, and possibly, imagination. I have these 4 books: WPF Control Development Unleashed Experiences Pro WPF 2008 Presentation Professionals Programming WPF Chris Sells WPF in Action Visual Studio 2008 One finished, two other half way, the other one just started. I sort of expected more from the "WPF Control Development Unleashed" one. Anyway, do you know any more books about advanced WPF features, and control building? Or even about how WPF works internally. Let me know what are your favorite WPF books, maybe I've overlooked some of them. Thanks!

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• Side effect of calling ValidatorEnable method: sets focus to control associated with validator

  - by Velika2

  When I called this function to enable a validator from client javascript: `ValidatorEnable(document.getElementById('<%=valPassportOtherText.ClientID%>'), true); //enable` validation control The side effect was that focus was shifted to the txtSpecifyOccupation textbox (the control associated with the Validation control) <asp:TextBox ID="txtSpecifyOccupation" runat="server" AutoCompleteType="Disabled" CssClass="DefaultTextBox DefaultWidth" MaxLength="24" Rows="2"></asp:TextBox> <asp:RequiredFieldValidator ID="valSpecifyOccupation" runat="server" ControlToValidate="txtSpecifyOccupation" ErrorMessage="1.14b Please specify your &lt;b&gt;Occupation&lt;/b&gt;" SetFocusOnError="True">&nbsp;Required</asp:RequiredFieldValidator> Perhaps there is a way to enable the (required) validator without having it simultaneously perform the validation (at least until the user has tabbed off of it?)

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• Slider control for mediaplayer using jquery

  - by Geetha

  Hi All, I want to create a slider control to control the video. When the video starts to play the slider has to start moving. If drag the slider to some other position the video has to play from that position. How to achieve this. Sample code: <script src="prototype.js" type="text/javascript"></script> <script src="slider.js" type="text/javascript"></script> var slider1 = new Control.Slider('handle1', 'track1', { animate: true, range: $R(0, document.mediaPlayer.SelectionEnd), max: document.mediaPlayer.SelectionEnd, min: 0, sliderValue: 5, startSpan: 'span1', onChange: function(v) { handleSliderChange(v); } }); function handleSliderChange(value) { document.mediaPlayer.currentPosition = value;} Problem: How to include the automatic move. the slider this working only when we move the handler.

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• help me understand the following javascript relate to AsyncFileUpload control

  - by sean717

  Hi, in my current project I used a AsyncFileUpload control from AJAX Control Toolkits. After I got the async file upload part working, I needed to filter the file type so users can only upload image files. I found the following code off web and it worked well: function uploadStarted(sender, args) { var filename = args.get_fileName(); var filext = filename.substring(filename.lastIndexOf(".") + 1); if (filext == "jpg" || filext == "jpeg" || filext == "gif" || filext == "bmp") { return true; } else { // force uploading cancel args.set_cancel(true); // set reason of cancel args.set_errorMessage("Invalid File Format Selected"); return false; } } The problem is : I don't understand this javascript. What is the type of args parameter? Where are the methods such as "get_fileName()", "set_cancel()" defined? I went to the homepage of the AsyncFileUpload control but couldn't find any documentation regarding the "args". Can someone help me out explaining this Javascript? Thanks

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• Winform custom control in WPF

  - by Erika

  Hi, I'm inserting a custom winform control in a WPF/ XAML window, however i'm realising that the sizing seems to be very different, what i designed in winform to be 730pixels wide for instance, when placed via a WindowsFormsHost, in a container 730pixels (or at least i think they're pixels..) wide, the control looks much larger and doesnt fit in the host and results in clipping from the right and bottom. Would anyone know how to make these sizes match or something? I'm really at a loss and its very difficult to fix a custom control to make it look as it should off hand on WPF! Please help!

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• ASP.NET User Control Value

  - by Steven

  I created a DatePicker user control (ASP code below, no code behind) which is simply a textbox, image button, and a sometimes visible calendar. <%@ Control Language="vb" AutoEventWireup="false" _ CodeBehind="myDatePicker.ascx.vb" Inherits="Website.myDate" %> <%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" _ tagprefix="asp" %> <asp:TextBox ID="Date1" runat="server"></asp:TextBox> <asp:Image ID="Image1" runat="server" ImageUrl="~/Calendar_scheduleHS.png" /> <asp:CalendarExtender ID="Date1_CalendarExtender" runat="server" Enabled="True" TargetControlID="Date1" PopupButtonID="Image1" > </asp:CalendarExtender> Can I somehow tie or pass the value of the TextBox as the value of the whole control to use in the calling code?

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• Example of configuring wxStyledTextCtrl/wxScintilla control as code editor for custom language

  - by Greg

  How do you enable actions like Goto line number Find(/Replace) There don't appear to be default triggers for these actions. There are a bunch of methods on the control, but I'm missing the first step of how to get the 'events' that would trigger these. For instance, how does one hook ctrl+f or F3/Alt+F3 in the control and make them do a find? Should I be looking at each key using EVT_STC_KEY? Would also like any examples of using this control with Custom language definition (say something similar to C++, but not C++) Auto completion (basic keywords to start, or including variables)

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• ScriptManager in a User Control inside a UserControl

  - by user204588

  Hello, I have an asp.net user control, userControl1.ascx, and another user control, userControl2.ascx. userControl2 is inside userControl1. userControl1 is inside an UpdatePanel control. userControl2 has a button in it then I want to have do a normal post back when pushed. I want to use ScriptManager.RegisterPostBackControl(button). I have a ScriptManager on a master page. I don't know how to access the ScriptManager in userControl2 to register the button in the Page_Load event. So, How can I do this?

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• embed google map in wpf control

  - by Dave Turvey

  Hi, I am trying to create a wpf control that will display a map image using google maps. I want to be able to centre the map on a longitude and latitude specified by the application. Ideally, the control will then allow the user to move a map marker and store the latitude/longitude of the marker in the application. The only way I can think of doing this is to use a WebBrowser control and create a HTML string at runtime that shows a map of the desired location. This seems like an awkward solution and won't allow me to easily retrieve the marker location. Does anyone know of a better way to accomplish this?

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• How to Handle UriFormatException in standard Web browser control in .Net Compact framework

  - by Sundar

  I have developed a browser in my application using the standard Web Browser control. It is throwing URIFormatException and the application crashes when navigating to some sites like "WWW.oosai.com" and also on clicking back or forward buttons when there is no internet connection. I tried handling the exception but it is not working try { webBrowser1.Navigate(new Uri(address)); } catch (System.UriFormatException) { return ; } the stack trace is like this bei System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) bei System.Uri..ctor(String uriString) bei System.Windows.Forms.WebBrowser.get_Url() bei System.Windows.Forms.WebBrowser.WnProc(WM wm, Int32 wParam, Int32 lParam) bei System.Windows.Forms.Control._InternalWnProc(WM wm, Int32 wParam, Int32 lParam) bei Microsoft.AGL.Forms.EVL.EnterMainLoop(IntPtr hwnMain) bei System.Windows.Forms.Application.Run(Form fm) bei Sts.Windows.Forms.FormRunner`1.GuiThread() In one of other topic a guy as said this exception is handled gracefully by the web browser but in my case am not to handle and moreover my application crashes with a error message like "Aarya.exe as performed an illegal operation and please report this to the administrator" Can anyone one help in handling the exception and is their any event to identify the availability of internet connection in web browser control

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• change Visibility of a control in ASP.NET code behind (c#)

  - by Axel Grude

  How do you set the visibility of a (fileupload) control from ASP.net code (I need to hide a fileupload control in a webuser control from server site, otherwise hasFIle is always false). Also setting the "Visible" property to false does not work (as is confuses the AJAX panel so the fileupload forgets that it has a file). theFileUpload.Visible = false = does not work so I want to try to set the CSS style visibility to hidden or display to none. The main problem is I want to do it from the server side (I know how I could do it on client). Is there a safe way to overwrite theFileUpload.Attributes["styles"] in case I modify other CSS styles in there, also throwing a whole CSS class at it (by moidifying the CSSClass property) seems like overkill. thanks in advance Axel

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• WPF Binding Question - Change Label Text based on Modifier Key Control

  - by Chuck Savage

  I have a context menu, that I'd like to change the Header based on whether the Control Key is pressed or not. Right now I have, <MenuItem Header="Send To"> <MenuItem ... /> <MenuItem ... /> </MenuItem> I'd like based on the Control Key being down to be, <MenuItem Header="Move To"> <MenuItem ... /> <MenuItem ... /> </MenuItem> All I really need to do is change the Header text, because inside the code I know how to check for the Modifier key being Control.

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