Adding a button to all active windows...

[price]

Dear all, I have a program which, when active, sits in the taskbar. So long as the progam is open I want to add a button next to the min/max/close buttons on all open windows (operating system windows xp). Does anyone know where I can find example code where this is being done... I have searched through the code project website but haven't been able to locate anything of this nature and would be really grateful if someone could give me some help. Thanks Andrew