How do I add items to all windows' window menus?

Question

I'd like to write a utility in the vein of PowerMenu - it adds some extra stuff into all applications' window menus (alt-space, that menu).

How does one go about doing this?

Answer 1

Look here http://stackoverflow.com/questions/138616/how-to-add-custom-item-to-system-menu-in-c

Answer 2

It's a classic code posted ~14 years ago on google (groups)
See Win32 grp for official method (MS, with hooks)

Answer 3

1. Inject some code to each window's process.
2. Use GetSystemMenu() in the hook to retrieve that windows "alt-space" menu
3. Make your modifications
4. Cleanup

I'd personally use SetWindowsHookEx(), WH_CALLWNDPROC, and a CallWndProc to achieve step 1, requiring a call to UnhookWindowsHookEx() in step 4, and bit of custom message pumping to get step 2 rolling. That's just personal preference though.