As fordlawnmower said, hashtables are much better suited for this job. Just use a timer or so to ocassionally store the hashtable to a file, in case of a sudden crash, and load the file back in the hashtable in an on START event or so.

Also, instead of checking if the nick IS a guest nick and halting, why not check if the nick ISNT a guest, and then write to a file, else do nothing. saves a bit code and looks somewhat more neat, imho.

I might post my own seen script in a while, when it's completely done. :_)