The KDE File Manager appears to be central to just about
everything you do in this environment.
In the introduction to the help section, Torben Weis says:
KFM is KDE's file manager. At the same time it is a full featured web browser, ftp client and tar archive utility and it acts as a server for other KDE applications, since it offers its network service that make up KDE's network transparent file access.I think this is the desktop == browser integration for which Windows is aiming. In my opinion, the KDE folks have done a fantastic job of integrating these functions.
At the left you see a picture of the KDE file manager and the KDE help page. Again, these have been cropped and pasted to save screen space.
One thing to note: since this is a browser model, the entire system is based on single clicks rather than double clicks. This could be annoying to long-time Macintosh or Windows users.
At the left is a screenshot of the Templates folder. This is
technically not part of the file manager, but it's worth pointing out.
The idea of templates is borrowed from OS/2, and essentially lets you set up an icon that is linked to a particular URL, document, or application to be started in a particular directory.