>I'd like to send a carriage return to another application's pop-up window from VFP. I can get the hWnd handle of the window, but don't know if it's possible (or how to) to pass the keypress to the other form.
>
>Any assistance would be appreciated.

If you have the hWnd of the other form, you can direct a keystroke to it using the SendMessage() API call, discussed in the API section here on UT.

If you know the Window title, or a part of it, for the other app's pop-up window, it's really trivial to do using the Wscript.Shell's AppActivate() and SendKeys() methods:

oShell = CREATEOBJ('Wscript.Shell')
oShell.AppActivate("The popup menu title")
oShell.SendKeys('{Enter}')
oShell = NULL