[CentOS-virt] WinXP Xen guest: compare VNC vs RDP

>  I am interested in the multiple connections allowed with VNC for support 
>type console sharing.  When connected with RDP, the console of the VM has a 
>login screen, so you can't use VNC to the console at the same time as a RDP 
>connection...

Remote Assistance parallels the behavior you're after with RDP.