Testing for control that HAS focus

[Wilko Verweij]

I read Appleman's "guide to the win32 api" a few times and I find it a great book. I learned not only how to use single API calls but especially to understand in which situation you should or could use an API call. It also explains the context of each API call. Is a bit old now, and was written for VB, not PB, but I learned a lot from that book.