That would be in your configuration file for aolserver... when you start it you give it a line like
bin/nsd -ft yourserver.tcl
in yourserver.tcl you will see a section
ns_section "ns/server/${server}/tcl"
ns_param library "/web/${server}/tcl"
The sample config that I took from the install documentation has that in there. The parameter library will source all the files in that directory.
