How to comment lines in DOS batch scripts

Although there is no real DOS prompt in Microsoft Windows operating systems since Vista, rather just it's emulation, don't let if trick you - DOS prompt still represents great and valuable resource for making scripts (which sometimes can grow quite in size and be quite complex) with wide application scope. But in this process you'll for sure be experimenting with various commands and before you'll accomplish your desired goal you'll probably want to (un)comment certail lines of code.

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