>I know that I can use the use the API call SendMessage passing in the Window Handle, Msg as long, wParam, and lParam values to a specific application. My question is how to set up my application to "Receive the Message" in VB. Is there a comparable "GetMessage" or some type of API call that I can use or how do I get my VB app to trap for or execute my code once the "Custom Message" has been sent to my waiting application?
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>Thanking you in advance for your help.

Read this MSKB for some help on this: http://support.microsoft.com/default.aspx?scid=kb;EN-US;q176058

The question I would have is what are you trying to do? If you want to have other applications use functionality in your program a better approach is to make it an "ActiveX Exe" and expose some functions or even properties in public classes.

Just my .02