- activeWindow active() 
- Undocumented in source. Be warned that the author may not have intended to support it. 
- addvoid add(Window window) 
- Undocumented in source. Be warned that the author may not have intended to support it. 
- hasActiveWindowsbool hasActiveWindows() 
- Undocumented in source. Be warned that the author may not have intended to support it. 
- removevoid remove(Window window) 
- Undocumented in source. Be warned that the author may not have intended to support it.