Although only one statement per line is allowed, a long statement can span multiple lines if an underscore " _" preceded by a blank is placed at the end of a "broken" line. String definition cannot be split in several lines, concatenation need to be
MsgBox($MB_SYSTEMMODAL, "", "This is a rather long line, so I " & _
"broke it with the underscore, _, character.")
The semicolon (;) is the comment character. Unless the semicolon is within a string, all text following it is ignored by the script interpreter/compiler.
; The next line contains a meaningful, end-of-line comment
Sleep(5000) ; Pause for 5 seconds
You can combine underscore and semicolon to put comments on lines and still have a long statement span on next line.
Local $aArray_1_ ; This _ is not a continuation character, nor is the next one
Local $aArray_3 = [ _
["Word", 4], _ ; Comment 1
["Test", 3], _
["pi", 3.14159], _ ; Associate the name with the value
["e", 2.718281828465], _ ; Same here
["test;1;2;3", 123], _
[';', Asc(';')], _ ; This comment is removed, but the strings remain.
It is also possible to comment of large blocks of script by using the #cs and #ce directives.