Comments are used to 'comment out' code that you don't wish be used inside your scripts.
;Single line command /* This is a multi line comment and all code between the open comment And the close comment will be 'commented out' */
Comments are used to comment out whole lines, even the multi-line comments are used to comment whole lines, which is the main difference between mIRC's commenting system and most other common languages that use /*...*/
;Comment line /* This is a comment. */ We're still in a comment since the line above didn't start with */ So it didn't acknowledge it as the end of the comments. */ Since this line did, it is taken as the last line comment line.
As you can see from the above example, comments are generally line based and a comment is used to comment the whole line, including the line to end the comment block. The only exception to this rule is when you start a multi-line comment block from a concatenated line, as illustrated below:
Commands | /* Comment | Comment2 Commands2
In the above example the | is taken as a comment, nothing after the /* is taken as anything other than a comment, with the exception of a line starting a new comment. If you open a new comment inside a comment, that too must be closed before you can again issue commands.
Commands /* Comment line one /* Comment line two Comment line three */ Comment line four Comment live five */ Comment line six Commands2
Multi-blocks and single line comments differ when it comes to parsing concatenated commands.
Commands | ;Comment | Commands2