OpKey Agent is capable to execute maximum two test executions parallelly. When you add Suite(s) to the Grid Execution then all the added Suites are first queued. And they are placed in Queued Sessions list. In case, you trigger more than two test executions simultaneously, then beyond first two test executions are placed in queue. They are called as Queued Sessions. These queued sessions will be executed through Hub of any user working on the same OpKey Web domain. You can view list of queued sessions by clicking on the Queued Sessions under Tools menu.
The page displaying list of Queued Sessions will get open as follows: