KDE offers you complete network management via the KDE Control Centre (kcc) (when it will be finished). This makes your life as a potential UNIX system administrator very easy: From now on, setting up servers will be faster and easier. Because configuration is easier, there will be fewer mistakes and the security problems caused by them.
This point gives you information about the users that are connected to your UNIX box via the SMB (Session Message Block) Protocol. SMB is the protocol used mainly by Windows 95 and WindowsNT machines to share files and folders.