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INT 21 - LANtastic - GET SHARED DIRECTORY INFORMATION
        AX = 5FB1h
        DS:SI -> 64-byte buffer for link description
        ES:DI -> ASCIZ machine and shared directory name in form
                 "\\machine\shared-resource"
Return: CF clear if successful
            CX = access control list privilege bits for requesting user
                bit 5: allow attribute changing
                    6: allow physical access to device
                    7: allow program execution
                    8: allow file renaming
                    9: allow directory deletion
                   10: allow file deletion
                   11: allow file/directory lookups
                   12: allow directory creation
                   13: allow file creation
                   14: allow open for write and writing
                   15: allow open for read and reading
        CF set on error
            AX = error code