...
>  5. How can you tell which users have been logged on for over a week?

On 6.0 PP1 and later you could write a script like this:
(not tested!!)

   PARM who="@S", days=7
   # This script shows all jobs/session ("who") that have been
   # logged on more than "days" days.
   if setvar(_jobcnt,JOBCNT("!who",_jobs)) = 0 then
      echo No job/sessions match "!who"
      return
   endif
   echo  The job/sessions below have been connected more than !days days:
   setvar i 0
   while setvar(i,i+1) <= _jobcnt do
      if JINFO(setvar(_job,word(_jobs,,i)),"ConnectMin") > !days then
         echo   "#!_job"  ![JINFO(_job,"JobUserAccountGroup"] &
                ![JINFO(_job,"IPAddr")]
      endif
   endwhile


Jeff Vance, CSY