INT 21 - Phar Lap 386/DOS-Extender - GET REAL-MODE LINK INFORMATION

	AX = 250Dh
Return: CF clear
	EAX = CS:IP of real-mode callback procedure (see #01358) that will
		  call through from real mode to a protected-mode routine
	EBX = 32-bit real-mode address of intermode call data buffer
	ECX = size in bytes of intermode call data buffer
	ES:EDX = protected-mode address of intermode call data buffer
Notes:	this function is also supported by FlashTek X-32VM
	X-32VM guarantees the intermode buffer to be at least 4 KB
SeeAlso: AX=250Eh