What's diffence between GUI_unload_all and GUI_close_all!

GUI_open加載GUI map文件(也可编輯GUI map文件),如果你只想编輯GUI map文件,你可以用GUI_open功能打開GUI map文件來编輯,而不加載這個文件.
用GUI_close功能關閉文件.
用GUI_unload和GUI_unload_all功能卸除已經加載的 GUI map文件.
使用GUI_close_all後不能對GUIMAP文件進行编輯,而GUI_unload_all則可以進行编輯

GUI_open => load and edit the GUI Map (load and edit)
GUI_close => close GUI map and you can not edit it any more (only close)
GUI_load => load the GUI map, but you can not edit it.(only load)
GUI_unload => unload the GUI map, also you can edit it because you did not closed(unload and edit)