Torque script symbol "?

#1 The first root main that is written in chapter 4 has this line of code,

$pathList = $addonList !$= "" ? $addonList @ ";control;common" : "control;common";

What is the significance of the "?" symbol. I could not find it on the complete script symbol list.

#2 The $ symbol means the variable is a global variable available to all scripts and functions. other variables are local so they're only accessible to the function they appear in. make sense?

#3 It is a conditional

booleanExpression ? if True do this : if False Do this;

#4 Thanks for the reply,
One thing I noticed about the '?' operator is that it seems to only work in this type of context. I unsuccessfully tried to use it like this:

(1 >= 0) ? $string = true: $string = false;
echo($string);

But when combined with an assignement operator and a comparative operator it works fine:
$num = 1 >= 0 ? $valueA: $valueA;

Thanks again for the reply.

#5 As long as whatever comes before the ? evaluates to 0 or 1, it should work.

#6 Yes, Intuitively speaking it should work that way, however if you use it you will notice that it will only work when the assignment operator is also used.

$someVariable = 1 ? $var = 100 : $var = 200; // $var is successfully assigned 100.
echo($var); // output will be 100

1 ? $var = 100 : $var = 200; // $var is NOT assigned 100
echo($var); // output is blank.

Just an observation. Thanks for the input.

#7 Oh, you were talking about that one...:)