Click it to load MG-Shelf which holds the scripts that U have embed before.

Items above the "Update This Menu" : All embed user scripts will be organized with their categories, shown as menus  in this section.

Update This Menu : Update the pop up menus of MG-Shelf.

MGShelf manager..: Select it to load MG-Shelf manager to manager your embed user scripts.

MG-ShelfConvertor..: Convert shelf files from higher maya version to lower version ones.

Open MGshelves folder..: Browse the folder that stores the MG-shelves data.

MGshelf Help..: Select to load MG-Shelf help.