Tailing Users

You could set up a history file for each user in their profile if that isn't already done. After that you can list the location of each users history file in a text file that might look like this
/home/user1/.history
/home/user2/.history
When you want to view what each user is donig you can run a script that is set up like this
for FILE in `cat location.txt`
do
echo $FILE #tells you what file you are viewing
echo "" #space for readability
tail -f $FILE #view the current file
echo "" #readability
echo "" #readability
done

This script will tail each file in your location document one at a time. You should pipe the script to more when you run it or redirect the output to another file that you can page through.

Good luck.