Simultaneous-Use Issue

[James]

I have freeradius 1.0.5 installed

my end-users are able to login simultaneously using the same username 
and password, the radacct table is recording the aggregating session 
time that the multiple simultaneous users use.

in my radcheck table I have all my users login attributes set to:

User-Password = somepassword
Max-All-Session = 123456
Simultaneous-Use := 1

Is there extra attributes that I need to set or configuration that I 
need to add in order to not let the same user login simultaneously 
through different machines?

Thank you,

James