User-agent: *
Disallow: /sessions
Disallow: /user_sessions

User-agent: libwww-perl
Disallow: /

User-agent: plaNETWORK Bot Search
Disallow: /

User-agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)
Disallow: /

User-agent: Plesk
Disallow: /