Send the following commands in the body of an email message to LISTSERV@LISTSERV.NET and you will receive copies of these information documents by email:

      INFO REFCARD INFO GENINTRO

Alternatively, there is a nice homepage with lots of information at: http://www.lsoft.com/default.asp Clicking on "INFO", and "MANUALS", and then on "LISTSERV General User's Guide" takes you to a nicely written manual which can be viewed online, or downloaded in a variety of wordprocessing formats.