I installed xvnc at fedora 10

on windows machine 1 i can connect to the server with vnc viewer (from realvnc)
when i connect on windows machine 2 to this fedora machine, my session at machine 1 is disconnected.

How can i connect at the same time to the fedora machine and see on both windows machines the same screen?

Thx in advance

grtZ
mikje