Pixel Tracking Classes?

I have a requirement to track pixels from client websites. I’m using Xojo to develop a reporting app for stuff in databases. I want the stuff to be reported to me via tracking pixels. Are there classes in Xojo that can be used for this? I’m already using ODBC and TCP comm threads, but don’t know how one communicates with a site with tracking pixels in .net or php.

Anybody have any ideas?