INT 2C P - Cloaking - SET SECONDARY STACK                                       
	AX = 0029h
	DX:EBX = new value for SS:ESP of ring 3 secondary stack
Return: CF clear
Desc:	inform RM386 of the ring 3 interrupt stack location
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00