Context menus are a way to shorten the time that analysts spend in the copy, alt+tab, paste cycle to allow right click integrations with a default set of websites that bring additional context to an investigation.  These are the default integrations that come with RSA NetWitness Suite.  You can locate the existing ones as well as add custom sites by locating this path:

Admin > System > Context Menu Actions

These Right click actions can be found in investigator and events view when right clicking on the appropriate metakey to locate the dropdown menu of actions

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Additional Context Menu actions can be found here:

https://community.rsa.com/search.jspa?q=context+menu&place=%2Fplaces%2F1875&depth=ALL 

The following is a summary list of the default actions for external sites that exist in the RSA NW platform:

Name Active on metakeys URL
Google file.hash,  alias.host http://www.google.com/search?q={0}
Robtex DNS alias.host,  domain.dst http://www.robtex.com/dns/{0}
SANS IP History ip.src, ip.dst,  ipv6.dst, ipv6.src, orig_ip http://isc.sans.org/ipinfo.html?ip={0}
Google Malware Dignostic for IPS and Hostnames ip.src, ip.dst, ipv6.src, ipv6.dst, orig_ip, alias.host, domain.dst http://www.google.com/safebrowsing/diagnostic?site={0}
BFK Passive DNS Collection ip.src, ip.dst, ipv6.src, ipv6.dst, orig_ip, alias.host, domain.dst http://www.bfk.de/bfk_dnslogger.html?query={0}
Malwaredomainlist.com Search ip.src, ip.dst, ipv6.src, ipv6.dst, orig_ip, alias.host, domain.dst http://www.malwaredomainlist.com/mdl.php?search={0}&colsearch=All&quantity=50
Malwaredomains.com Search ip.src, ip.dst, ipv6.src, ipv6.dst, orig_ip, alias.host, domain.dst http://www.google.com/search?q={0}+site%3Awww.malwaredomains.com
SamSpade Search ip.src, ip.dst, ipv6.src, ipv6.dst, orig_ip, alias.host, domain.dst http://samspade.org/whois/{0}
UrlVoid Search alias.host, domain.dst http://www.urlvoid.com/scan/{0}
McAfee SiteAdvisor for Hostnames ip.src, ip.dst, ipv6.src, ipv6.dst, orig_ip, alias.host, domain.dst http://www.siteadvisor.com/sites/{0}
Robtex IP Search ip.src, ip.dst, ipv6.src, ipv6.dst, orig_ip http://www.robtex.com/ip/{0}.html
CentralOps Whois for Ips and Hostnames ip.src, ip.dst, ipv6.src, ipv6.dst, orig_ip, alias.host, domain.dst http://centralops.net/co/DomainDossier.aspx?addr={0}&dom_whois=true&dom_dns=true&net_whois=true
ThreatExpert Search ip.src, ip.dst, ipv6.src, ipv6.dst, orig_ip, alias.host, domain.dst http://www.threatexpert.com/reports.aspx?find={0}
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