You can use FindWindow('Window', 'Your Unique Window Caption');
If that returns the Handle of the form then to increase the check point you could then
SendMessage(TheHandleIGot, WM_USER+100, 1,0);
and your form should be processing this message and thus return with a apply.
This of course only works in windows and for the life of me I can't figure out why they didn't create the window using the TFORM name class instead of window because this weakens the attempt to find the exact one..