I have a server that i need to monitor what the .bash_history file for the root user already logged in to the server

I am logged in as root and have another person logged on as root and i want to monitor what they are doing:

root ? :0 2010-10-19 11:54
root + pts/1 2010-10-22 02:27 (
root + pts/2 2010-10-19 11:59 (:0.0)
root + pts/3 2010-10-22 03:41 (

I am using pts/1 and other person is using pts/3 i want to see what they are doing and need to know how to do this with out scripting something to monitor activity.