Group Policy for Terminal Clients

Hi,

I am having one 2xmachines as domain and Terminal server
as member Server. i am running group policy on my domains
now i want to run group policy when my client connect to
Terminal server only that time because when user login my
domain default group policy run for all users. So please
help me how i define the policy when my use login in
termial server that time aply. i want to change the
desktop wallpaper, disable some programe, divert my
decument to center store.

Thanks

Naeem