Two questions for more expirienced programmers

Hi,

have two questions regarding Blitz programming:

1) How much processor time will this instructions take:
Viewport x1,y1,x2,y2
Origin x1,y1

In other word if I have few separated parts on the screen is better to calculate on whole screen or usig viewport will not take processor time.

2) Does anybody know how to make main game loader. f I create game package containing few games, how can i start each of them from some kind of menu screen if they are made as separated projects (few exe files)

Thanks,
Jarvis