Hi folks, I've written an ENVI program that uses the envi_define_menu_button routine. Typically it comes with a distribution of other software written by folks in our group, and the routine makes menu items in two places: under the Basic Tools area and also under a separate Tools area in our typical menu structure that includes a top-level menu hierarchy rooted at the same level as "Basic Tools". I was installing it on another computer for someone who doesn't need the rest of our tools, so I had no need to give him the modified envi.men file that we use. Is there a way, or a function call, that lets a program know that a particular menu item (ref_value keyword in envi_define_menu_button, for example) does not exist, and so that portion of the code can be skipped? Thanks, M