Another improvement in W2K3 terminal services is a technology taken from WinXP that allows you to take over a remote session (PcAnywhere like).
This also solves the annoying
"Terminal server exceeded the maximum numbers of allowed connections"
issue we all know too well.
To "take over" a remote session, type the following at the command prompt:
mstsc /console (or modify your RDC shortcut with /console)
The RDC graphical interface will start as usual, but the connection to the W2K3 server will not create a new RDP session.
Note:
It is not possible to "remote control" the active console session without throwing the current user out.
You can not have 2 simultaneous connections to session 0.
Update: Options have changed under Windows 7 and Windows 2008 R2. The console option is replaced by the /admin option.