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As you make changes to a source file, an asterisk (*) appears in the title bar to indicate that the file has changed since it was last saved. Each source window associated with a source file can retain its own sizing and other window attributes.
Save a new file or another copy of an existing file
If you already named the file, the Save command saves changes without displaying the Save As dialog box.
If your file is unnamed, the Save As dialog box appears.
You can also save another copy of an existing file. This procedure is useful for maintaining revised copies of a file while keeping the original unchanged. For more information, see To save a new file or another copy of an existing file.
To save a new file or another copy of an existing file