Is there a way to send a user message to any of app's active dialogs?

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I have an app that receives external HW-driven events, and I need to
pass that information along to any of a number of dialogs that may be
active when the event occurs (there can only be one active at any
given time). I thought some version of PostMessage would work, but I
can't get it to work. It does work if the dialog, on initializing,
passes back to the app its hWnd, and the app then uses that hWnd in
PostMessage. I can use that technique if I need to, but I'm hoping
there's a way for an app to post a message to an active dialog without
first knowing its hWnd. Sorry if this is obvious...

Mike

.

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