Defining and using variables and parameters

- Variables and parameters.…We've already taken a look at variables,…but we're going to take another quick look at them.…We're going to use them quite a bit in expressions.…So I've just got control flow open here,…and if I right click, I can go into variables.…You've seen this before.…So here I'm showing two variables.…If we drill across, we can see that it's…got a scope, and it's got a data type,…and the values.…Here's expressions.…As a matter of fact, let's go ahead…and open that very quickly.…

So here's expression builder,…and within expression builder…we can use the different variables that we have.…So as we come on down you see here's…my user variables.…If I expand system, here's all the system variables…that I have available to me.…Now if you want to know a little more…about your variables, if you just select…a variable and then we hit F4,…we'll open the property box for the variable.…We can come through…and we can see other information.…

So there's the description,…which we have nothing in the description.…But we have an expression, so if we added…