I installed a product called xming, a light weight X11 server product on Windows 7 laptop. From remote RHEL system I redirected display to Win7 laptop then launched X11 GUI app. I was not able to launch X11 apps and have them appear on laptop display as intended. To fix it I added -ac to the properties of xming launch desktop icon. I been searching through Windows and xming docs but can't find explanation. My guess is it is like xhost + on unix that allows connections from anybody. Can anybody explain why this worked?