Combine with Write for read/write access?

By MSDN,
        FileAccess  - Defines constants for read, write, or read/write access to a file.
            Read - Read access to the file. Data can be read from the file. Combine withWrite for read/write access.
            ReadWrite - Read and write access to the file. Data can be written to and read from the file.
            Write - Write access to the file. Data can be written to the file. Combine withRead for read/write access.

I don't understand the meaning of Combine withWritefor read/write access in the member "Read". What does it mean? Code would be great.