Question 1) and 2) were moved into separate thread Which Windows remote connections bypass LSA? and what r definitions of login vs. logon session?

3)

Do I understand correctly that multiple remote RDP sessions are supported by Windows XP but require additional (or modified) licensing?

Which one?

Or it is always illegal to run multiple RDP sessions on Windows XP? even through non-MS commercial software?

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Update1:

I already understood my error - the main questions were about definitions (important to find the common language with others) and the licensing questions were collateral - but it was already answered.

I shall try to separate these questions leaving here the questions about RDp licensing and migrating other questions into separate thread

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Update2:

Trying to "work around" licensing terms is pointless and wasteful of time

I never try "working around" and I never ask anything like this, I am not specialist in licensing. My clients/employers provide me with tools and licensing support. They have corporate lawyers, planning/accounting/purchase departments for these issues.

The questions that I ask is the matter of scalability and efficiency (saving my and others time) in my developing work.

For ex., Just because I need autentication against Windows AD it is time-saving to use ADAM instead of deploying full-fledged AD with DC + servers + whatever else?

Nobody is forcing you to use Windows XP

I shall not rush into re-installing all my operating systems on all my development machines (at home, at client premises) just because a few guys have a lot of fun downvoting development-related questions in serverfault.com. If I do so, I make a joker from me in the eyes of my clolleagues et al

Update:
I unmarked this question as answered since it had not even adressed the question, at least mine.

Should I understand that Terminal Server PRO, allowing Windows® XP and Windows® Small Business Server 2003 to host multiple remote desktop sessions, is illegal?

Related:
My answer to question Has windows XP support multiple remote login session (RDP) at a time?