INT 2F - MS Windows - POSTMSG - GET API ENTRY POINT AX = 1684h BX = 4321h (virtual device ID for POSTMSG device) (see #02642) ES:DI = 0000h:0000h Return: ES:DI -> VxD API entry point (see #02712,#02714) 0000h:0000h if the VxD does not support an API