Hi Eric, I think what you are thing of is the following. Just use help routine after you compile every piece of your code: help, /ROUTINES From the IDL Help you can see what the keyword /ROUTINES does: ROUTINES Set this keyword to show a list of all compiled procedures and functions with their parameter names. Keyword parameters accepted by each module are shown to the right of the routine name. If no arguments are provided, and the information you are looking for is not displayed, use the FULL keyword to prevent HELP from filtering the output. Cheers, Fernando