>>If you're content with them just getting into a remote desktop and doing stuff there, Terminal Services is the ticket - it comes with Windows, isn't too hard to set up, and is historically (IIRC) a simplified version of Citrix.
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>I have heard that Terminal Services is faster than Citrix - any comment?

Only anecdotal evidence. I've tried TS over pretty much the same network where I used Citrix before, but then not necessarily the same machine - last I heard they are in the process of replacing them - so I can't really say it's the same. TS does seem faster, but also a bit flakier. For one, the clipboard isn't always transferred, usually first transfer works, then several don't, then all of a sudden one works. Also, transfer to your local drives seems a lot faster via Citrix. OTOH, it does recognize my keyboard layout, whereas Citrix doesn't (IIRC - it's been more than a year since I'm not visiting office via Citrix).

I'd expect TS to be somewhat faster, because it's more lightweight (amazing for a M$ product :) and more tied to the OS. Citrix has better administration tools and Web access, and usually there's that annoying DOS window while it executes the logon.bat, which I couldn't hide - happens seamlessly on TS.