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