Check in ISboxer, you have a "main macro" called FTL assist, this tells your group to assist the character you are using(thats why everyone needs to have diferent modifiers to make it work as it toon A has 1 and toon B has another etc).
So the assist part comes from ISboxer telling your FTL Dps button 1(for example) to use "FTL assist me" to your other toons, so by poressig 1 you tell your other chars to assist you within ISboxer thats why its never showed anywhere

sorry for shitty spellin g im a swede hehe hope it solved anything