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Hi Kholnuu,
I'm a php programmer but not an expert of xoops.
Probably there is a better method but I try to explain mine.
When a user registers his self he submits data to register.php with $op=newuser. $op is used to switch to the right operation implemented in register.php.
So if you want to modify de dafault behavior you can serch
in "newuser" where the script set the notification parameter.
I'm sorry but I have a terrible English
Bye