simple multiuser considerations

Hi everyone,
Managing sessions and cookies looks simple if you go by the varied
tutorials on the web. But I have a few questions about real multiuser
issues which i could not get any tutorials on:

1)say, I have a page doesalot.php on http://www.mysite.com/ which will
be accessed by say 50 users at a time. Then, my session id checking
script must run 50 instances, one for each user and the appropriate
database table must, at the end of that time, get 50 rows, one for each
session (of course, i've written the db insert code into the page right
at the top). Does this happen by default or do I have to set something
in php.ini or anywhere else or worse, take care of it in the script by
checking for IP via $_SERVER['REMOTE_ADDR'] etc.

2) If it is just 5-10 users per second maybe it will not be a problem,
but a worst-case load of say 50-100 requests per second will definitely
be an issue (assuming my host has given me enough bandwidth). Is there
some setting for such tuning?

It'll be great if someone could point me to a site or tutorial that
deals with these issues.

Thanks in advance,
Regards,
Joseph S.

.

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