FEX Question

[Deviant]

Hello,

I just purchased and installed Flight Environment X.  I'm new to scenery add-ons, so I hope these questions don't sound too ridiculous for you guys.  

1.  After I have selected themes for clouds, water etc., are these themes now default everytime I start FSX?  

2.  Do I have to run FEX prior to running FSX everytime to get the selected themes?  

3.  Lastly, does the FEX program have to be open and running while FSX is running or if I close FEX will the selected themes be active in FSX?

Thanks.