🚀 go-pugleaf

Can two discrete ttsession environments communicate through a common file
scope?  I think not, but I may be wrong.  The environment is: many logins
to one machine, all running non-GUI apps.  OK, that means the .login gets
	exec ttsession -c $SHELL
At boot time, I wish to run a service that supports common needs of ALL the
users' apps; say, for example, ticket printing.  All users (running under
different ttsessions) fire up apps that join a common file /tmp/common_services.
Apps fire "print a ticket" messages into this scope; the "server" registers
interest in them and performs the operation.

So far I can't get it to work.  Am I missing something?  I know that the file
scoping mechanism works if I use the same ttsession (via $SUN_TT_SESSION) but
this solution is not possible.