)
Call DOS Requester entry point with:
	STACK:	WORD	destination function
		WORD	destination VLM ID (see #02861)
		WORD	source VLM ID (0000h = application program)
	other registers (except BP) as appropriate for function
Return: AX = status code (0000h,8811h,8846h,8848h,8853h) (see #02860)
	ZF set if successful, clear on error
	other registers as appropriate for function
	STACK popped
	BP destroyed