INT 21 - WCED v1.6+ - INSTALLATION CHECK

	AX = 0A00h
	DS:DX -> 6-byte buffer whose first two bytes must be 00h
Return: buffer offset 02h-05h filled with "Wced" if installed
Program: WCED is a free command-line editor and history utility by Stuart
	  Russell
SeeAlso: AH=FFh"CED"