We are building a WebTabs.ascx that will host a WebTab control.  The WebTab control will be populated at runtime from configuration data pulled from a database.  I want to leverage the WebTab's EnableLoadOnDemand and the UserControlURL.     When I click on the tab, I would expect the control set in the tabs UserControlURL to launch.  So far, no problem.

But all the target ascxs need the caller to provide parameter data so they know what to go get.  What is the best way to get parameter data from WebTabs.ascx to the ascx that gets fired on the TabClick.  I had considered session cache, but a user may have multiple instances of this page up at once.  I would need a unique id that the instance of the WebTab.ascx shares with each of  the ascx's it launches.