Networking Applications are used to configure, connect, and maintain connections over networks and Applications that are used to communicate over Networks. Therefore this category lists applications that provide functionality like eMail reading, ICQ, FTP and IRC Clients and other applications for KDE.
Look at the description of the main KDE Category for more information about KDE.
Taken partly from Dan Kegel's ISDN Page:
ISDN cards are like modems, but 5 times faster. They require special telephone lines, which cost a little (or a lot, depending on your phone company) more than normal phone lines. They provide up to 64 kBit communication speed on one channel and multiple channels can be combined.
This category contains applications that display or configure ISDN configuration and provide a KDE GUI.
The Samba project allows Unix computers to access Microsoft Windows shared folders over the Network by providing the SMB protocol. This category contains applications that display or configure the Samba configuration and provide a KDE GUI.
The SETI at Home (Search for Extraterrestrial Intelligence) project allows desktop computers all over the world to participate in analysing satellite data for traces of intelligent life forms. This category contains applications that display or configure the seti-Application and provide a KDE GUI.