Automatic Loading of SKILL code into Composer or Virtuoso

I am a new Cadence user who is very (probably too) familiar with the Mentor tool set and the way in which AMPLE code gets automatically loaded into Mentor's schematic or layout windows.  Now that I am transitioning to Cadence 6.1.X and SKILL, I am trying to familiarize myself with how SKILL gets loaded into the various windows.  Although I do have SKILL class in my future, I am trying to jumpstart things by learning various aspects of SKILL in advance of such a class.  I am trying to go through the Cadence documentation to discern the mechanism by which userware is automatically loaded for the tool in which it is intended. In Mentor-land, for example, userware locations are defined by the AMPLE_PATH environemental variable and files are loaded into the appropriate tool by filename, for example $AMPLE_PATH/da_ic/schematic.ample when a schematic window is opened.  Is there a Cadence equivalent?