Not a problem. Would you mind posting your declarations and bb function call? Does it still say "user lib function not found"?
If so, make sure that these two lines:
...are in a .decls file which is found in the userlibs folder. Remember, it doesn't matter what you call the .decls file as long as it is plain text, there is only one '.lib "user32.dll"' line, and it's in the userlibs folder.
Then, just put this line:
If you don't see where your problem is, we'll help you figure it out.
If so, make sure that these two lines:
.lib "user32.dll" FindWindowEx%(hwndParent%, hwndChildAfter%, lpszClass$, lpszWindow$):"FindWindowExA"
...are in a .decls file which is found in the userlibs folder. Remember, it doesn't matter what you call the .decls file as long as it is plain text, there is only one '.lib "user32.dll"' line, and it's in the userlibs folder.
Then, just put this line:
hwnd% = FindWindowEx(0, 0, "CLASSNAME", "TITLE") Notify hwndinto a program and run it. It should return 0, but you can try it with an actual classname and title (found from WinDowse) and it should work.
If you don't see where your problem is, we'll help you figure it out.