What is L_stat for?

[Super user]

there is this file, /usr/lib/uucp/L_stat, on this system which is of the
format

system	time	##

where system is a uucp system name, time is a long integer time, and ##
is some unknown number.  this is the old style uucp on SCO Xenix 2.2.1.
what i want to know is, what does ## represent?  i talk to about 500
different systems per month and would like some way of knowing
when/what/etc is going on.  in particular, i'd like to know the number
of systems which i have successfully had a conversation with in the
past day/week/month.  the time field gives something that looks like a
time, however, it is updated even if the conversation is not successful,
or no connection is made.

all help is welcome ...

- john.