If you trust the software, it does a pretty decent job of generating automated wavelength solutions for NeAr or NeNeAr arcs.
The philosophy is to trace an aperture down the order center, and then cross correlate this trace against an archived solution to identify lines and make a rough fit. Then the lines are re-centroided and and arc solution is written to disk.
If you wish to inspect the solutions - and you should, at least for the first several tries - you can select "User Reidentify" from the preferences menu. If this mode is called, a GUI will launch to allow the user to check the line centroids and evaluate the fit manually.
The X_IDENTIFY GUI
The initial screen of the line ID GUI is shown below:
