Hey Mari (or anyone in the know), Can you give me one of your nifty undocumented functions to automatically show the spectral library viewer? And maybe display a spectrum (if that's a different routine than envi_plot_data....i can do this myself by querying the spectral library file for the spectrum name and then plotting it with envi_plot_data, i just wonder if there's a faster way). I couldn't spot anything with Help, /routines....except i did see an enviobj_spectrum object. I don't think I really need that though, i just need to launch the viewer. Jeff