Int 15 Fn 12  - Desqview V2.20+ - Send Message - "setflags" - Set Object   [Q]

   AH = 12h
   BH = 15h
   BL = object
       00h DWORD on top of stack
       mailbox, keyboard, or pointer only
       02h mailbox for task whose handle is on top of stack
       03h mailbox for current task
       04h keyboard for task whose handle is on top of stack
       05h keyboard for current task
   STACK: DWORD flags (see #0379,#0380)

Return: STACK popped

Notes: only available if the API level has been set to at least 2.20
   equivalent to performing SUBFROM and ADDTO calls on the object
   if a mailbox has bits 4 or 5 set, you must use "READINTO" rather than
     "READ" (see AH=12h/BH=13h"READINTO") to retrieve messages

See Also: AH=12h/BH=0Ah,AH=12h/BH=0Bh,AH=12h/BH=16h

Bitfields for DESQview mailbox object flags:
Bit(s) Description (Table 0379)
 0 all mail messages in common memory
 1 allow write even if closed
 2 don't erase messages when mailbox closed
 4 (DV/X) append messages with like status and sender (stream-oriented
     mail)
 5 (DV/X) store mail in expanded memory (pool grows as needed)
 6 (DV/X) make mailbox into non-owned mailbox

Bitfields for DESQview keyboard object flags:
Bit(s) Description (Table 0380)
 5 exclusive input when keyboard in use for input