05b11880__awt_Documentation_Differences__What_the_Permission_Allows
[Permission Target Name] showWindowWithoutWarningBanner Without this warning an applet may pop up windows without the user knowing that they belong to an applet. Since users may make security-sensitive decisions based on whether or not the window belongs to an applet (entering a username and password into a dialog box for example) disabling this warning banner may allow applets to trick the user into entering such information. [What the Permission Allows] 
Display of a window without also displaying a banner warning that the window was created by an applet
java.awt Documentation Differences
What the Permission Allows