Files/Subdirectories in /tmp

Hello all, Can anyone give me an idea what files and subdirectories found in /tmp are necessary? Maybe even an idea what some are for? For example: /tmp/gpg- I have six of these gpg subdirectories within /tmp . Each contains a single file called S.gpg-agent, identified as a socket, zero bytes. Are these necessary? What are they for? I have six subdirectories that each begins with ssh, such as ssh-dDwubb4505 and ssh-gqo1014839. Are these necessary? What are they for? I also have a variety of other files, each zero bytes, that begin with ssh, such as such as gs_IGTUs1 and gs_9UgcT5. What are these files for? If it matters I'm running SuSE 9.1 pro. TIA Chris/CMS