Alan Norton <alan@ucar.edu>
Interaction Technique 3:
Export/import data to/from analysis toolkit 
¥Currently using IDL¨
¥User specifies region to export to IDL session
¥IDL performs operations on specified region
¥Results imported as new variables in VAPOR
Just note how it works.  Left variable is vertical momentum.  Export it to IDL, calculate vertical vorticity, display side by side.