I also get valid functioning cookies if I POST:
telnet argus.ayustar.net 80
POST /argus HTTP/1.0
Host: argus.ayustar.net
Content-Length: 21
func=login;name=guest
or even:
telnet argus.ayustar.net 80
POST /argus?func=login HTTP/1.0
Host: argus.ayustar.net
Content-Length: 21
func=login;name=guest
--jeff