Hi Iowa_Nate
 ... so... /tce.installed just links to files in usr/local/bin/?? ... 
Actually,  /usr/bin/tce-load  handles that. The files in  /usr/local/tce.installed  match the name of the extension being
loaded. The  tce-status -i  command uses them to display which extensions are currently installed. If an extension
needs any commands run right after installation, that extension will include them in a file for the  tce.installed
directory. If no file is included,  tce-load  creates an empty one as a marker.