title: Multiple users notify system
body: <p>I have to create a notify system, which will be remind users about what the others do. If one of the user add some order, the other should see it as alert or something like that. 
  So, my question is, which way is the best to do this. Should I use TTimer and ask every 5 minutes or you know better idea?</p>
  
  <p>Sorry for extreamly poor english... I'm from Poland ;)</p>