"popserver" is a generic name for the package handling the POP protocol. The distribution dependent module (Currently, this is only implemented for Red-Hat), translate this name to the corresponding package and checks if it is installed (popserver is imap on Red-Hat systems).
If the package is not installed (the check is done using managerpm) it asks the user if he wants to install it. If yes, managerpm is called again and takes care of prompting for the CDrom and also solve all dependencies related to this package.
This test is done a single time, so if you answered "no", you won't be bother again (You may have installed a competing POP solution for example).
So far, the call has been installed for popserver, dhcpserver, dnsserver and nfsserver. This correspond to the package which are generally not installed by default.
The fsbrowser module is now installed as a symlink (in /usr/bin) pointing to linuxconf-wrapper. This way, one can use fsbrowser without knowing about linuxconf-wrapper.