@T**
right, I don't think that works any more. You used get a number first and then people submitted their applications (at the window) in order of the number. The "agents" would collect low numbers and you could buy these from one of the guys outside.
They changed this around maybe two years ago to a system where there is just a queue to put in your application, there are no numbers to apply any more, and they take your application at a little desk at the front of the queue, you don't go to the window any more for a tourist visa, only non-immigrant go to the window. I think this is when the "no agents" sign went up as well.