Int 15 Fn DE18  - Desqview V2.20+ - Internal - ???                         [Q]

   AX = DE18h
   BP = function number
       high byte must be 10h
       low byte is function
       00h set ???
           BL = ???  (00h-10h, video mode???)
           BH = value to store
       03h set ???
           BL = ??? (stored in driver)
       0Ah get ???
           ES:DI -> 18-byte buffer to hold ???

Note:  calls video driver (NOP for Hercules driver,probably CGA and MCGA also)