Stockmarket.

[2003eclipse]

After reading in another thread people were talking about the stock market.
I have no idea how to get in to it. How you can buy stock or how the point system works. I wish i had a clue, because i was watching dow on cnn or something a little over a year ago and at the morning bell it dropped and dropped and dropped from what it was at and it went down to about -60 or something and i was like shit well i could buy some now, now more then an hour later it was ^120 and at closing bell it was around 240 yes this was an all day event for me watching dow anybody know how much money that could have been?
can you just invest a 100 dollars or do you have to buy an entire share of a stock?
what whats going on