Posting Registered message to another process?

"L.Allan" <>
Fri, 21 Dec 2007 12:36:17 -0700
I want to communicate between two SDI processes with something like:
PostMessage(HWND_BROADCAST, gMyRegMsgId, 123, 321);

The "Poster" and "Postee" both have calls in OnInitialUpdate for:

***** Poster code ****
void CPosterRegMsgView::OnClickPostButton()
  BOOL flag = ::PostMessage(HWND_BROADCAST, gBbFindMsgId, 1234, 4321);

***** Postee code ****
BEGIN_MESSAGE_MAP(CPosteeRegMsgView, CFormView)

LRESULT CPosteeRegMsgView::OnBbFindMsgId(WPARAM wParam, LPARAM lParam)
  CString msg;
  msg.Format("W: %d L: %d", wParam, lParam);
  ::MessageBox(NULL, msg, "CPosteeRegMsgView", MB_OK);
  return 0;


With the above, I can step through each of the programs and check that
gMyRegMsgId is the same. However, when I click on the button of the "Poster"
program, nothing seems to be received by the "Postee" program. I'm expecting
the MessageBox to show up, confirming the desired communication.

What am I doing wrong? Is the HWND_BROADCAST argument to PostMessage

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