Remote X display access

[Alex]

Hi,

What is the best way to securely permit a remote X application to
display on as local system?

I'm trying to get system-config-services to run on a remote FC14
x86_64 system to my local FC13 x86_64 system. It's on a local internal
network. I've tried setting the display and allowing access using
xhost, but it still appears to have an access control problem.

Also, how can I do this across the Internet? Wrap it in ssh?

Thanks,
Alex