Here is a great Citrix tip from Sam Jacobs.
When deploying a Netscaler / Web Interface solution, it is always desirable to be able to determine the *real* IP address of the client.
This is especially useful when MetaLog is deployed.
Here is a KB article describing the procedure to set an IIS header on the AGEE with the value of the user's real IP address:
How to Override the Web Interface 4.5 Client Address Mode Discovery