I've been studying the quick reference card for a long time, and still can't get how to use the key "T" (Call Target). I was attacking a monster, and press "T" but it never call what target I was attacking, like it shows on the game box. Then I was told to hold Ctrl + Atl + T to call your target in party chat. Is that the way to use the button?
I also saw the guy kept using call target with mini map signal. My party little window will appear an eye, or a target small icon. I can click on that icon and press Space bar to assist him. How did he do that?
And seriously, there are too many hidden controls in this game! eg. hold Ctrl + Shift + H to close all UI. hold Shift and press Print Screen to take screenshot without UI. key in /deaths to check how many times you died. key in /age to check how long have you played using this character.
I seriously hope there is more, like the one you can see your friend's class and level.