Request for a tough bit of code

[amykhar]

What I need to do is possible, I just have no clue how to do it.

Have you ever seen the Amazon honor system box? The code, on an affiliate's server, accesses a script on Amazon's server. This script then greets the user based on their AMAZON cookie.

I need to do something similar. For a variety of reasons, my front page is hosted on one host and domain, and my forums on another. I would like to have a script on the forums server, that when accessed on the front page server, does two things:

1. It marks the user as being online on the Who's online.

2. It greets the user with their forum name on Who's online.

Anyone have any ideas on how I can accomplish this?

Thanks in advance,
Amy