Int 15 Fn 10  - Vmix - "sys_virtual" - Execute Conforming Function In Pro  [O]

   AH = 10h
   STACK:  DWORD   pointer to function
         N WORDs   function args

Return: AX = function's return value??? (not specified in documentation)

Note:  while the function is executing, the following global descriptors are
     available:
       20h stack segment
       38h code segment of function
       40h data alias for function's code segment
     additional GDT descriptors can be allocated using AH=02h with
     function "assign gdt"

See Also: AH=02h"VMiX",AH=51h"VMiX"