Int 15 Fn DE17  - Desqview V2.26+ - "assertmap" - Get/set Mapping Context  [Q]

   AX = DE17h
   BX = function
       0000h   get current mapping context without setting
       nonzero set new mapping context to BX

Return: BX = mapping context in effect before call

Notes: mapping contexts determine conventional-memory addressability; setting
     a mapping context ensures that the associated program and data areas
     are in memory for access.  Usable by drivers, TSRs and shared
     programs.
   caller need not be running under DESQview
   this API call may be made from a hardware interrupt handler

See Also: AX=1016h,AX=1117h,AX=DE21h,INT 2F/AX=1685h