That alias essentially takes the passed command line, that should look like this
????@N@????@N@????@N
each ???? could be anything likely a action of the ref maybe i dont know
each N is a number
there could be 1 or more repeats of ?????@N each seperted by a @

Now all it appears to do is take this ???? and insert it on a new line into the "controller.ini" file using the number of lines in the file + 1 as the item name for the /writeini

example...

---controller.ini --- start ---
[controller]
2=blah 23
3=blob 4
4=fred 999
---controller.ini --- finish ---

/EXTRAGROUND [email]qwerty@987@car@1@devil@666[/email]

---controller.ini --- start ---
[controller]
2=blah 23
3=blob 4
4=fred 999
5=qwerty 987
6=car 1
7=devil 666
---controller.ini --- finish ---

* these two lines appear to modify the ???? in some way (might be highlight removal might be anything!)
if %grid == specialgrid { var %item = $slice( %item ) }
if %grid == wrestlergrid { var %item = $slice( %item ) }


** All up it looks like a section of code that just a storage of the controller commands or settings maybe.