When you install the Stuffit Expancer for Linux, you get not only the binaries, but also the man pages. I put the two files (named unstuff and stuff) into the following directory: /usr/local/man/man1. They are now available when I type: man stuff or man unstuff.
I couldn't figure out how to change the host name. The host name is e.g. displayed by default (Suse 9) in the command prompt and used by several applications. If you move your computer between different networks, this name changes as the default (Suse 9) is, that the host name is assigned by the DHCP server. But you can override these setting using Yast2: Control Center -> Yast2 modules -> Networ Devices -> Network Card -> authenticate!
How to change the name of items on the desktop (e.g. the Trash bin) Go to the directory ~/Desktop. There are .desktop files, which you can edit. To change the name of directories (e.g. the trash bin) edit the hidden file called .directory.