This may be useful with programs with no wildcards alowed, like the expand command, that expand a compressed file. 5.- Other orders. To comment a complete line, you should use REM at the begining of it. But this will make the line a label, I conseder this quite rough. It's up to you.
Every programming language has at least one way to make comments.
This is extremely useful to make your program easier to read to other people and to yourself in future. But this is not this way when you call a .bat file. This is my message. Press a key. In most of cases this it more than enough.