If you want to rent remote support software from a SaaS provider, you have lots of options - Citrix GoToAssist, LogMeIn Rescue, Webex Support Center, and others. But if you want an on-premises option for remote support software, you have fewer.
Until recently, Netviewer was one such option. http://en.wikipedia.org/wiki/Netviewer Netviewer was a German company. Their software enabled online meetings and remote support. While they emphasized software-as-a-service, they also allowed security-conscious customers to purchase Netviewer Support and install it on a self-hosted server.
Back in early 2011, Citrix Systems, Inc., acquired Netviewer. It seems to have been more an acquisition of market share than of technology, as no major updates to the Netviewer 6.x series occurred after the acquisition. Citrix already had GoToMeeting and GoToAssist, and, quite logically, encouraged Netviewer users to upgrade to these.
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