Remote X Server

Can someone on the list point me to where I can read about how to access a remote X-Server from my Linux box? I need to access another Linux box with my Linux laptop, and it would be nice to do it with X. The other box supposedly has X set up already for XDCMP, and people can use Hummingbird Exceed to get a remote X session. I've read the X and XDCMP howto's, but they don't really discuss this. Thanks, -ronc