Semi-automatics: How do they work?

Being me, I like knowing how things work when I'm going to be using them.  At least the basics that is.  To that end, I wondered how all the internal spring etc of a semi-automatic pistol work together to load the ammunition, eject the casing, and cock the hammer.  I found this you tube video. 

Please ignore the cheesy 1980s-ness of it  It does a great job of explaining the process, despite horrifying mustaches.

If you want even more detail, try this Glock video.  You'll have to read, but it does show every little part.