Scripts are very usefull there you can change all options in the game like Starting Money or Command Points or Map seeing. Also you can put Movies in the map and much more.
It looks like so if you make a new script just go to neutral or any other team and press new. Then this window comes give the Script a name like here "Map seeing".
On this Window you choose when the Script is activated. True = permanent
On this window you choose what happens if the Script Conditions is True(when it the happening happens what you engined).
Press on New on the previously page and choose the happening/Movie ......
On this Page you choose what happens when the Script Conditions is false(when the happening what you engined doesn't happen or it happens wrong.). The Choosing is the Same like in the previously page.