Create overlay graphic for other running programs

Ok, I have a small idea for creating an "overlay" graphic panel that i wish to hook ontop
of another running program on the computer.
For example, lets say we have internet explorer, and i wish to create a small java application
that will "paint" ontop of internet explorer. Perhaps drawing a transparent image right in
middle of internet explorer.
Anyone have any suggestions on how this could be accomplished?

This is a VI which calls the undocumented MessageBoxTimeout function.
It is similar to the MessageBox function (http://msdn.microsoft.com/en-us/library/ms645505%28v=vs.85%29.aspx), but it does include the ability to have the message go away after a certain amount of time (setting timeout to 0 leaves the dialog open indefinitely).
If you set Message Box Modality to MB_SYSTEMMODAL, it will display in front of all applications.
Attachments:
AIT - WinAPI - MessageBoxTimeout.zip ‏86 KB

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