Vista and Windows 2003 Server - Remote Desktop Connection questions

[Victek]

I am using Remote Desktop to login to a Windows 2003 Server. Once in I can
run it again (from the server desktop) to access a laptop running XP on the
internal LAN, however I cannot access another PC on the LAN running Vista.
Is it possible to remotely connect from 2003 Server to Vista? At the moment
I'm working around the problem with Tight VNC, but I'd rather use RDC.

 

[Victek]

I am using Remote Desktop to login to a Windows 2003 Server. Once in I
can run it again (from the server desktop) to access a laptop running XP
on the internal LAN, however I cannot access another PC on the LAN running
Vista. Is it possible to remotely connect from 2003 Server to Vista? At
the moment I'm working around the problem with Tight VNC, but I'd rather
use RDC.

Let me simplify the question: Are Windows Server 2003, Vista and XP
"transparent" with regard to Remote Desktop? Does it matter which OS the
session is initiated from or can these OS's connect to each other regardless
of the Host/Guest arrangements?