What is hWnd

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I am pretty experienced but I have absolutely no idea what hWnd is. Please Help.

If your using Windows, its the API call for a window.
It stands for (h) handle (Wnd) Window.
Its the standard call all other commands use to gain access to a window.

Microsoft likes to prefix their variables with the lowercase letter h to represent a 'handle' to that object.

For instance, an hDC is a handle to a device context.

If you've done any programming using the Windows API, you will encounter many such syntactical conventions.

You can reference any given window through its hWnd handle.

Here's a link to a previous post about communicating with external windows.
http://www.blitzbasic.com/Community/posts.php?topic=32315

Thank You Both so much.

Does that mean to some extent my program can control other windows?

If you use the Windows API, yes, to some extent.

How do you get the API ?

You have to use userlibs. Do a search on this site for userlibs and .decl files.

Could You Possibly help me with my problem? It's in the bug reports.