usReadOnly (USHORT)

      New read-only value.

      TRUE

        Read-only mode set.
      FALSE
        Read-only mode cleared.

      ulReserved (ULONG)

        Reserved value, should be 0.

      rc (BOOL)

        Previous read-only value.

        TRUE

          Read-only mode was set.
        FALSE
          Read-only mode was cleared.

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