mIRC's commenting system is not too intuitive.. it only works after newline, beginning-of-file or $chr(32).
So, in the following example..
;comment1
alias test {
;comment2
/test2 ;comment3
}
comment1 and comment2 are valid, but ;comment3 is not and will be sent to /test2 as an argument!
A way to get around this is:
So that, effectively, comment3 is on a newline, even though it appears not to be if you ignore the functionality of the pipe "|" character.