INT 2F - WinDOS v2.11 - SET ASSIGN VALUE                                        
	AX = AF13h
	BL = number of drive to remap (00h = A:)
	DL = number of drive to be accessed via drive number BL
Return: nothing
Desc:	remap a drive letter
Note:	the remapping can be canceled by specifying DL=BL
SeeAlso: AX=AF00h"WinDOS",AX=AF14h"WinDOS",AX=0601h