We also use LAMPP, and you will find the maxclients and other like settings here in a default LAMPP install: /opt/lampp/etc/extras/httpd-mpm.conf
You will need to know how your server is set to use which MPM, since you will see this file is divided into settings depending on the type. For Linux, prefork or worker are the options. You can use the apachectl -l (that's an EL) script (in /opt/lampp/bin) to show you this.
A good place to get info on these settings is: http://httpd.apache.org/docs/2.0/mod/mpm_common.html#maxclients
The LAMPP defaults on our box (prefork) are:
Hardware and performance
Very often random logouts and page loading halts
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