The functions for accessing topologies begin with tpm_ac.
tpm_acclose
Closes a topology.
tpm_acexist
Checks if a topology exists.
tpm_acload
Loads a topology into memory.
tpm_acopen
Opens a topology.
tpm_acqty
Counts topologies.
tpm_acunload
Unloads a topology from memory.
tpm_acupgradeopen
Changes access from read only to write.