Int 2C Fn 0013  P - Cloaking V1.01 - "issue_system_modal_message"          [m]

   AX = 0013h
   EDX = message box flags (see #2252)
   DS:ECX -> ASCIZ message text
   DS:EDI -> ASCIZ caption

Return: CF clear
   EAX = response code

Note:  this function is only available while MS Windows is running in enhanced
     mode

See Also: AX=000Fh,AX=0012h

Bitfields for message box flags:
Bit(s) Description (Table 2252)
 3-0   response codes (see #2253)
 7-4   icon codes
   1 = Warning hand
   2 = exclamation mark
   4 = asterisk
 9-8   default response (0 = first button, 1 = second, 2 = third)
 12    message is system model
 15    don't change focus
 29    hang with interrupts enabled
 30    do not window
 31    execute ASAP

(Table 2253)
Values for response codes:
 00h   OK
 01h   OK, Cancel
 02h   Abort, Retry, Ignore
 03h   Yes, No, Cancel
 04h   Yes, No
 05h   Retry, Cancel