Sorry for the slow reply.
I was going to say there is no way to run an external program inside another program’s window. But it looks like this MMB program is able to do that.
If it was a text based console program then you could use RunPiped to redirect input and output and display that inside a Suneido Window.
Windows OLE and ActiveX controls were designed to let you do this kind of thing, but they are tricky to work with and the external program has to implement the ActiveX interface. Suneido embeds the Internet Explorer browser component this way.
Sorry, it looks like it is possible, but I do not know how to do it. If you could find an open source program that allows this then we might be able to figure out how it is done.
Does anyone else out there have any ideas?