<= R0 = result
C set if escape pressed
Z set if result was in any way Yes.
This call asks the user for confirmation of an action by changing the pointer and waiting until a key or mouse button is pressed. Select returns the value 121 (character y), Menu and Adjust return 110 (character n). Keypresses return the lower-case ascii value.
This should only be used in applications outside the desktop, if ever.
See PRM 1, page 940.
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