How does one get a VB app to fill out an internet form? That is, I want, as an example, to have my program log onto eBay and tell eBay my userID and password so that I can establish a session that will let me get at information from eBay that you can only get if you are logged on?

I can suck down eBay pages with no problem, but unless my session is logged on, some information is not present in the HTML pages that get built by the server.

I tried planet source code and somewhat to my surprize couldn't find anything.