Networking equipment maker Cisco is buying endpoint security company Twingo Systems of Mountain View, Calif., for $5 million in cash, the company said Friday.Networking equipment maker\u00a0Cisco\u00a0is buying endpoint security company Twingo Systems of Mountain View, Calif., for $5 million in cash, the company said Friday.The deal will add Twingo's Virtual Secure Desktop technology to Cisco's VPN 3000 Concentrator product. The new technology will make it easier for Cisco to clean up after\u00a0Secure Sockets Layer (SSL) VPN\u00a0sessions on insecure, remote computers by removing sensitive information stored in temporary files, Web browser caches, cookies and e-mail, Cisco said.First released in July 2003, the Virtual Secure Desktop creates a virtual desktop environment on computers using SSL VPNs to connect to sensitive corporate networks. Information passed back and forth during the SSL VPN session is stored in encrypted form on the virtual desktop and erased from the machine at the conclusion of the session, according to information obtained from Twingo's Web site.Privately held Twingo already has deals with other leading SSL VPN makers, including Aventail and Array Networks.Array announced an OEM relationship with Twingo in January that adds Twingo's technology to Array's unified secure content access products. Aventail and Twingo said in November that Twingo was joining Aventail's Technology Partner Program, ensuring that the Virtual Secure Desktop will work with Aventail's hardware appliances.After focusing exclusively on IPSec\u00a0VPNs for years, Cisco unveiled its own SSL VPN, called "WebVPN" in November. SSL VPNs are increasingly popular, especially for mobile workers who wish to connect to office networks from airport kiosks or other insecure systems.As opposed to VPNs that use IPSec, SSL VPNs are typically "clientless," meaning they do not require a separate software application to be installed on the remote user's machine. They also rely on the SSL protocol, which is a part of most common Web servers and Web browsers and widely used to secure e-commerce transactions.Cisco expects to complete its acquisition of Twingo in the third quarter of it's fiscal year, which ends in July. Twingo will be added to Cisco's VPN & Security Business Unit, the company said.