The Keep Upgrade window is used to display upgrade information about a claimed keep or tower.
The window will appear automatically whenever you claim a keep or tower. The window will also appear if you right click on the Caption of a claimed keep or tower by your guild. Click on the Release Keep button to release a claimed keep or tower. Click on the Close button to close the window.
There is nothing shown when the window is concealed. The window is invisible with no graphics or controls to minimize the amount of memory used. Nothing will appear on the screen when you attempt to activate the window.