Comments by Glenn Dawson (Top 1 by date)

Running the John's example code gave me various results. I got back "\0\0\0\0", in one case, and "\\con", in another. I also got back several AccessViolationExceptions. (Win 7 64-bit)

SendMessage with WM_COPYDATA seems to work. I haven't tried it with PostMessage. There's an old CP article on this:

http://www.codeproject.com/KB/cs/ipc_wmcopy.aspx