I need to write a program that can monitor the activity of another program running on my computer. As preliminary research, I downloaded the API Monitor program from rohitab.com, to try to find which calls I would need to intercept in order to monitor the events I'm interested in. Unfortunately, I could not find API calls whose parameters contained the information I needed, even when I filtered by each API category separately.

Are there calls that API spy programs like this miss? If so, how can I find the calls I'm interested in? The only thing I know is that they correspond to different images appearing and disappearing the applications window.

Thanks for any info,
Johnny