More advanced tools didn't have to be installed, but still required local execution of software or at least web-browser plug-ins, extensions, or applets.
Some tools can even identify complex media objects such as audio and video players and offer capability of synchronous (coordinated) playback with start/pause/stop functionality.
Additionally, some modern cobrowsing solutions will also offer observation capabilities whereby a second person can view a live web browsing session, but not participate in its navigation.
[citation needed] Cobrowsing is difficult to implement due to the essential confidence requirements to share any real-time experience, and strong resistance provided by OS and browser security mechanisms.
[2] Also in 2014, Pegasystems acquired the cobrowsing tool Firefly, which was developed by a startup from Philadelphia, Pennsylvania funded by First Round Capital.