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If you're creating a batch file that you expect to be around for a while, especially if it does anything complex, it's a good idea to scatter remarks throughout the file to inform other people (and yourself) how the file works. To put a remark in a batch file, simply start a line with REM followed by a space. DOS will recognize the line as a remark and will not attempt to process it. If there is an ECHO OFF command earlier in the batch file, the remarks won't be displayed as they are encountered; otherwise they're displayed but not acted on.