I would like to know if it is possible to find out a users homepage, extract that information, and use it to send the user back to their homepage when they exit my site. I've searched for this info multiple times, using multiple parameters, but so far everything says I can only link to another page.
Your help and insights are greatly appreciated,
"Learning a user's homepage" and "sending him to his homepage" are separate questions. I don't know of any way of doing the first; for the second:
For Netscape, Opera, and Firefox:
For Internet Explorer: