INT 21 U - PC Tools 9 CPRLOW.EXE - GET CODE AND DATA ADDRESSES
        AX = 4402h
        BX = file handle referencing device "RECLOWLD"
        DS:DX -> buffer for address list (see below)
        CX ignored
Return: CF clear if successful
            buffer filled
        CF set on error
            AX = error code (01h,05h,06h,0Dh) (see AH=59h)

Format of address list:
Offset  Size    Description
 00h    WORD    segment of CPRLOW code
 02h    WORD    offset in code segment of ??? entry point
                (switches into protected mode)
 04h    WORD    offset in code segment of jump array (see below)
 06h    WORD    segment of copy of interrupt vector table at CPRLOW load time
Note:   neither the entry point nor the jump array is valid until after a
          CPR /LOAD, because CPR.EXE installs the code into CPRLOW at runtime.

Format of jump array:
Offset  Size    Description
 00h  3 BYTEs   initialize CPRLOW interrupt hooks
 03h  3 BYTEs   reset timers and enable CPR (hotkey enable)
 06h  3 BYTEs   disable CPR (hotkey disable)
 09h  3 BYTEs   clear ??? flag, hotkey disable, and ???
 0Ch  3 BYTEs   initialize delay loop counter (destroys AX,BX,CX,DX)
 0Fh  3 BYTEs   disable CPR completely (commandline /DISABLE)
 12h  3 BYTEs   enable ??? if CPR enabled by both cmdline and hotkey
 15h  3 BYTEs   enable CPR (commandline /ENABLE)

.