Most Internet users have dynamic IP addresses.
It could be a dial-up connection, or a broadband solution, ie xDSL or cable. This presents a problem for people who wants to run servers on their machine, since their friends wouldn't know how to get in touch with them. W e've released an easy to use client to automate the task of activating the flexiDNS service. The C client also comes precompiled for FreeBSD, Linux and Solaris. Please report bugs, if you find any.