Added in 1.9.1
/halt
Halts a script and prevents any further processing.
If used in a event with ^ prefix, will stop AdiIRC from showing the default text for that event.
Example
alias example {
;Echo 'some text!'-
/echo -a Some text!
;Halt the script.
/halt
;Echo some more text, but this line will never be executed.
/echo -a This echo command will never execute
}