2.70. VarName *global*
Sets the names of variables that will be remapped to and from the URL when Interchange writes it. For instance, to display the variable mv_session_id as session in the user's URL:
VarName mv_session_id session
The default can also be set in the etc/varnames file after the first time Interchange is run. Setting it in interchange.cfg is probably better for clarity.
There is also a catalog-specific version of this setting.