ustflags (USHORT)

      Tracking flags.

      Contains a combination of one or more TF_* flags as defined in the TRACKINFO structure.

    ptrackinfo (PTRACKINFO)

      Track information structure.

      This points to a TRACKINFO structure. The receiver of this message must modify this structure.

    rc (BOOL)

      Continue indicator.

      TRUE

        Continue sizing or moving
      FALSE
        Terminate sizing or moving.

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