Int 15 Fn DE15  - Desqview V2.20+ - Set Error Handling                     [Q]

   AX = DE15h
   BL = error handling mode
       00h post system error on all error conditions
       01h return carry flag set on calls to ADDTO, SUBFROM, and WRITE
       messages sent to mailboxes which fail due to lack of system
       or common memory
       02h (v2.26+) same as 01h, but also return null pointer for GETMEM
       calls which fail due to lack of system memory

Return: nothing

See Also: AX=DE0Ch,AX=DE16h