suggestion to install sys tray icon

[saivert]

You can write a small application in Delphi, C, C++ or whatever for this purpose. Using NSIS for such a task just doesn't work. NSIS is singlethreaded and only executes code in the context of the wizard pages. So you can't have it run forever waiting for arbitrary window messages (that you obviously want to hook). Don't spend time trying to make this trayicon application in NSIS. It's just a waste of time.

If you want to use C++, I have created a class wrapper for the Shell_NotifyIcon function Give me a PM and I will give it to you.