Atrium.launchURL launches a page as a tab in the portal. This is useful in those cases where you want to create applications that take advantage of the tab-style navigation provided by Atrium, but want to control displaying the tabs programmatically, rather than having the user select it from the menu.
url - a string representing the url to launch as a tab in the portal.
title - a string that becomes the tab label or title.
closable - a boolean true or false value. When set to false, the close icon “x” will not appear on the tab, preventing the user from closing it.