Create a logic_timer entity, for information on how to use it, go to the link in the sources below.
Sources:
http://developer.valvesoftware.com/wiki/Logic_timer
hammer is for source and source needs games compatible, games that have source need you to download steam, so no, sorry
6km
Everywhere! Internet is a way to connect to big servers located in everywhere - depends of the owner of the server.
Use the Source SDK tool Hammer Editor.
It moves heat energy - from the source and into the recipient. It works everywhere, even in a vacuum.
anything
A historical source can be anything. A letter, diary, painting, newspaper, anything.
Stock or Grip, Hammer, Trigger, Breech, Rail, Barrel, Sights, BB and power source.
Air , when compressed and contained can then be utilized as a source of power for a jack-hammer or any other air tool .
Yes, it is. Because you use windmills. The wind will never stop blowing everywhere.
A print source is a source printed on paper. EX: a book.
Yes, you do. You need steam and a source game such as Counter-Strike: Source. Or Half-life Source. Day of Defeat Source