edit right-click menu at the desktop

hi list, I want to add a menu item to the contect-menu that appears when you do a right-click on the desktop (in the doku known as action-menu. It appears a menu where you can add new files, links, log off etc. I want to add a menu item which open a terminal window. Do anybody know, where i can edit this menu? Everybody who lnows Fedora knows what I mean. Thank you Nils