Many of the questions you are asking have been discussed in depth already. Try to search for your answers before asking. Search is located under the area where you post your questions.
The last thing I want to do is stifle you inquisitive nature, because that is a good thing, but at the rate you are asking questions you are going to wear some people out.
Please search and read the great info available here. Look at the top of the major forum titles for stickies with lots of information. Read the entire manual. You can find the long version by clicking on All Programs/The Game Creators/FPS Creator/FPS Creator Manual. It and the stickies will clear up many questions you already have and save time asking more later.
Happy game making.
The forum provides a means to hide our true identity. Too bad we always screw up and let it be seen.