A popup window that must be dealt with before anything else: the rest of the screen is dimmed and blocked. Takes title (The popup's title and name). Returns: 1 while the popup is open.
title
String
If igiBeginPopupModal("Quit?") Then
igiText("Really quit?")
If igiButton("Yes") Then running = False
igiSameLine()
If igiButton("No") Then igiCloseCurrentPopup()
igiEndPopup()
EndIf