Client-sided

On the side of the client, ergo for the editor and administrator, you merely need a web browser that is capable of interpreting HTML4 with CSS, Java script, Layer and DHTML (Microsoft Internet Explorer from version 5 on or Netscape from version 6 on have been successfully tested regarding compatibility under Windows)
Internet/TCP/IP-network access to the web server. Minimum 30 KBit bandwidth should be available ;)