<PASSTHROUGH>
   <string>
   <password>
   <number>
   <datetime>
   <array>

   </array>
   <structure>

   </structure>
   <recordset>

   </recordset>
   <list>
   <cookie>
   <file>
   <boolean>
</PASSTHROUGH>

Variables which are passed into the fuse and passed back out of the fuse without being modified are known as passthrough variables.