...
> knew of any easy way to find out the last time a user logged on to MPE

The first time I read this question I was thinking you want to
show the user that is now logging on when s/he LAST logged on.
This is somewhat valuable as it lets the user know if their
logon was used more recently that they expected to see.  There
is not a built-in, automated way to get this info in MPE, but I
am sure there are 3rd party products that provide this feature,
and I don't think it would be too difficult to craft a solution
yourself via logon UDCs.

> I have a feeling that I have some very inactive users,
> and would like to boot them off the system.  Thanks!

BOUNCER was already mentioned as a way to log off inactive
users, and there may be other tools that do this.  Plain MPE
does not support this capability, but you can write a fairly
simple script that sorts the SHOWJOB output by INTRODUCED date.
Or, you can combine the new JOBCNT and JINFO functions (if you are
on MPE/iX release 6.0) to output just the jobs that are older than
X days.  There is a version of such a script on our Jazz Webserver
at: http://jazz.external.hp.com/src/scripts/jcnt.txt

HTH,
 Jeff Vance, CSY