timing, signals, etc.

What i do is:
When my user restarts the  window manager have startx kill all
AS400 sessions and restart them, usually 2 print sessions
and 3 display sessions. I have had a lot of problems
getting all sessions to start and done a LOT of testing, and arrived
at the following conclusions:
1. Kill sessions with signal 15.  This seems to always kill them and
        always allow a disconnect to occur.
2. Start sessions one second apart.  I am guessing this alleviates confusion
        of bunch of connections coming from same IP. That doesn't quite make
         sense to me but it solves the problem.

I'd love an opinion on whether this is solid procedure or if I am just
masking something.  Thanks.