Passing a vBulletin username into a chat program

[Ted2]

I am planning on using a chat service linked from my website. The chat service is accessed by embedding applet tags and parameters on my site, which will then display the chat service. One of the parameters is named "Handle". If no "Value" is passed for Handle, then the chat service prompts the user to enter a Value for Handle, of their choice, in order to chat.

Is there any way that the user's username from the vbulletin forums on my website can be [automatically] passed as the Value for Handle? I am hoping that I can add a link in the forums so that after a user logs in, they can click on the chat link and it would be automatically passed and they can chat with their same username. Is there a way? Thanks for any help!