Temporary files that are generated by a tool at runtime should be written to the default session directory using the SESSIONDIR environment variable.  Ideally, these temporary files should be removed when the tool no longer need them.

Simulation output files that are generated by a tool  should be written to the results directory using the RESULTSDIR environment variable.  This directory is created in the user's home directory for the user to easily find the simulation results.  The tool may also read from that directory and present a list of the resulting files to the user.