I'm not serving but this is what I've gleaned from the site;
It is possible for a soldier to be 'spotted' by his CO. This as far as I understand will result in a meeting where the possibility of Officer training is put forward to the soldier and depending on the soldiers response he may begin the officer application process.
However if this happens the soldiers is still required to attend both the AOSB briefing and Mainboard so it is no way a short cut to a commision as your post appears to hint at.
I'd just like to clarify that the first half of my previous post was serious - it is entirely possible to be selected for officer training whilst you are undergoing basic/phase 2 training, or even a few years into your career, as long as you display the right qualities, and are either identified as a potential officer, or express your ambition to become one and undergo assessment.
I'd also like to clarify that the second half of the above post is accurate, you judas, turncoat, labrador walking, shite dressing bastards
(JG, i know you're an Arrser, pull me up if you dare )