Sorry if I missunderstood but "Options - IRC - Logging" only tunrs off the logging for my OWN mIRC.
So if I wanna send this script to any1 else. The user also has to select this option first, before he can use this script. It just could be fine if he doesn't need to.

And a diractly command such as /log off ALL or sumth doesn't exist. The command /log off <window> does exist but it only disables the logging for the chosen window.
I've already been trying it on an on-text-event but the fist message of the user will still remain.
So just another question (maybe out of topic) ... is there a way to delete ALL the files which are in a window without to delete the window itself?