INT 62 - Cswitch - CHECK STATUS OF PREVIOUS LOAD_TASK                           
	AH = 13h
Return: AX = result
	    FFFCh no Memory Control Blocks available
	    FFFDh no TCBs available
	    FFFEh insufficient memory
	    FFFFh cannot open file
	    0000h load in progress (not done yet)
	    else  tcb indentifier
SeeAlso: AH=0Fh