No. The ToolTalk service does not allow explicit hostname qualification of pathnames. If you use a filename that contains a colon (:) symbol, the ToolTalk service searches for a filename that contains the colon symbol. The tt_message_file and tt_default_file calls return the realpath of the specified file as it appears on the machine on which you invoked the call. The ToolTalk service ensures that
If two clients file-scope to the same file on different machines, they can talk to each other without regard to how the two files are actually mounted on each machine.
A locally-valid, canonical pathname is returned back to you.