Bookworm
1) We are talking about sending people around when they are perceived to be in a dangerous position - nothing to do with TCAS.
2) The book says I can do it, and contrary to your comments about whether we have the knowledge or proficiency to make that shout it is a judgement call I will make if I feel it necessary. It is one I've yet to make for a commercial concern, but one I've often had to make for smaller aircraft.
3) I suggest you re-read my comments about licence and runway preservation
Of course booky - if you'd like to get an ATCO's licence and come and try our job yourself as you obviously know better than those of us who do the job day in and day out
