INT 21 - DOS 3.1+ - IOCTL - SET SHARING RETRY COUNT
        AX = 440Bh
        CX = pause between retries (default 1)
        DX = number of retries (default 3)
Return: CF clear if successful
        CF set on error
            AX = error code (01h) (see AH=59h)
Notes:  delay is dependent on processor speed (value in CX specifies number of
          64K-iteration empty loops to execute)
        if DX=0000h on entry, the retry count is left unchanged
SeeAlso: INT 2F/AX=1224h,INT 2F/AX=122Bh