Hi

>So this means I fire Marathon, open the database and execute the given statement and from then on it will work always for that database? And the directory name is C:\Program Files\Firebird\Firebird_1_5\UDF\ I found this already created in the folder and I will copy the dll there. That's nice, I can also get it copied there by InnoSetup on the clients machine, wow.
>

Exactly. You can load entire script and run it. You can also change names for functions in that script.

Regardin Marathon, another administration tool that I like is IBExpert. The personal edition is free, if you want to try it.
http://www.hksoftware.net/download/ibep_2004.9.12.1_full.exe