In case of value true, all TargetUrls assigned to tabs are loaded and while dynamic navigation between tabs is used, the fields on tabs will keep old values. It means that if the TargetUrl on one tab was modified and submitted to a server, then fields on another tab will not reflect those changes and contain old initial values.
In case of the value false, only one TargetUrl which is assigned to the active tab is loaded. If while navigating between tabs the previous TargetUrl was not submitted, then changes in fields on that TargetUrl become lost.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2