As part of Cisco's Self-Defending Network Initiave Cisco has announced a new product which relies on "the Cisco Network Admission Control program is innovative software developed by Cisco called the Cisco Trust Agent which resides on an endpoint system and communicates with the Cisco network. The Cisco Trust Agent collects security state information from multiple security software clients, such as anti-virus clients, and communicates this information to the connected Cisco network where access control decisions are made and enforced. Cisco has licensed its Cisco Trust Agent technology to Network Associates, Symantec and Trend Micro so it can be integrated with their security software client products." Currently the Cisco NAC software only works with Cisco network equipment and Microsoft Windows NT, XP and 2000 operating systems. Without the secret handshake Mac OS, Linux, Solaris and other operating systems will not be able to connect to a Cisco Self-Defending Network which limits its usefullness for ISPs.