The IDL Reference Widget is simple Dashboard widget for the Mac OS X operating system that allows quick access to the reference guide for the Interactive Data Language or IDL produced by ITT. The code used to make this widget is a modification of original code written by Andrew Hedges for his PHP Reference Function Widget. The widget is fairly simple to use, just download it at the link below, unzip and double click the file to install. You must have Mac OS X 10.4 or later for this to work.