BX VM_ID (virtual machine ID)
CX flags: bit 0: 1=wait until interrupts are enabled
bit 1: 1=wait until critical section is released
DX:SI 32-bit priority boost setting (DX=high word, SI=low word)
ES:DI callback function address
Returns: AX return code: 0000H (and CF is clear) in successful
0002H invalid priority boost
Info: This causes Windows to switch to a specified virtual machine and
then call a specified address.
This is used by network support software or software which needs
to perform certain functions while executing in a specific
Please see the Windows Device Driver Kit (DDK) for full