The following is a script from Eukalyptus that plays an audio file and displays an FFT Visualization. Let's call it the "Child". My goal is to be able to close it AND to send volume-level change commands from a Parent program (script farther below). I'm trying to use WM_CopyData for IPC but it's not working for me. Part of my problem is I'm unsure about what's needed to initialize WM_CopyData in the Parent program -- if this is even necessary.  I realize I could use the MailSlot UDF for this b