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jimkarvo: your comment has no relevance to the question posed by slyss.
In order to redirect to edituser.php after the second login (only?), you'll need to be able to check the number of logins. XOOPS doesn't save that information in any of the core files/modules. You'll need to build a check yourself (using a cookie?), and create an event where the second time someone logs in (from the same computer), he/she will be redirected to edituser.
That's the only way I can think of.
Herko