VB / multiple edits in a single session

[MR]

I have a VB app, starting TextPad session(s) via shell function calls, to edit multiple files. I would like to use a single textpad session to edit multiple files and have a way in VB to detect the completion of the edit session for each file. Can this be done? It appears that it may be with DDE, but documentation / sample code is scarce on both the TextPad and VB sides. Thanks.