INT 21 - 10NET v5.0 - 10MEMMGR.SYS - API
        AX = 4402h
        BX = file handle referencing device "MEMMGR0$"
        DS:DX -> 6-byte buffer for interface info (see below)
        CX ignored
Return: CF clear if successful
            AX destroyed
        CF set on error
            AX = error code (01h,05h,06h,0Dh) (see AH=59h)
SeeAlso: AX=4402h"10BEUI",INT 6F/AH=00h"10NET"

Format of interface info:
Offset  Size    Description
 00h    DWORD   address of entry point (see below)
 04h    WORD    version (0500h for v5.00)

Call entry point with:
        AL = 01h ???
            BX = ???
            Return: CF clear if successful
                    CF set on error
                        AX = error code
        AL = 02h ???
            ???
        AL = 03h ???
            ???
        AL = 04h set/restore memory allocation strategy
            BX = subfunction
                0000h set strategy
                0001h restore strategy
            Return: CF clear if successful
                    CF set on error (if function disabled)
                    various registers destroyed
        AL = other
            Return: CF set
                    AX = 0000h
                    BL = 01h

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