INT 16 - AAKEYS - GET NEXT KEYBOARD EVENT                                       
	AX = 0600h
Return:	CF clear if successful
	    AL = next keyboard event in event buffer, FFh if buffer overflowed
	CF set on error
	    AL = 00h buffer empty
	BX destroyed
Program: AAKEYS is a TSR(Terminate and Stay Resident) A program which remains in memory after terminating in order to provide services to other programs or the user.  The name comes from the name of the DOS function call used to remain in memory after termination. by Anthony Appleyard which records keyboard scan
	  codes in a 256-byte buffer in addition to any normal processing which
	  takes place
Note:	the installation check consists of calling INT 16/AX=06xxh (where 'xx'
	  is any subfunction other than those listed here) and testing whether
	  AX=BEEFh on return
SeeAlso: AX=0601h,AX=0602h,AX=0603h,AX=0604h