Problem with 'last'

[Peter Miles]

I'm running SCO UNIX 386 v3.2.2. I've noticed that the 'last' 
command doesn't seem to be very accurate. When I run it, it 
shows at least one user who has been logged on (supposedly) 
for over 2 days on a particular TTY. Even though the user hasn't 
been logged in for that long, and other users have logged in 
on the same tty. 

Here's an excerpt from the last command...

User     Line  Device       PID    Login time       Elapsed Time Comments
pmiles   A03   ttyA03       23974  Wed May 22 09:28      00:09            
pmiles   A02   ttyA02       23455  Wed May 22 08:58      00:10            
alanb    A04   ttyA04       24589  Wed May 22 08:16      00:03            
pmiles   A01   ttyA01       24545  Wed May 22 00:47      00:00            
alanb    A03   ttyA04       24533  Tue May 21 23:57      00:04             **
pmiles   A01   ttyA01       23955  Tue May 21 23:01      00:53            
pmiles   A03   ttyA03       23748  Tue May 21 22:30      00:00             **
cathy    A01   ttyA01       23535  Tue May 21 21:33      00:04            
pmiles   A03   ttyA03       22757  Tue May 21 21:21      00:19             **
mike     A01   ttyA01       22457  Tue May 21 21:09      00:23            
mike     A04   ttyA04       21960  Tue May 21 20:49      00:32            
johnh    A02   ttyA02       20761  Tue May 21 20:30      00:48            
alanb    A03   ttyA03       9578   Tue May 21 01:11   2d 10:14   logged in **
mike     A01   ttyA01       8862   Mon May 20 22:51      00:32            

As you can see (from the lines marked **) several people have 
been logged in on ttyA03, but last still shows that 'alanb' 
is logged in and has been for over 2 days.

Is there a more accurate way of measuring the login times and 
length of login for users? I need this information to be accurate 
to the nearest minute.

                -- Pete
-- 
Pete Miles			uaa1006 at dircon.co.uk
				...ukc!dircon!uaa1006