What does LogMeIn use to capture the screen image so quickly...

Question

I saw a lot of duplicate suggestions when I typed this in, but they didn't necessarily answer it fully...

I mean, it can't be that complicated to do, but it seems that log me in does it pretty quickly and there's not a whole lot of lag.

I mean its basically:

1. Copy frame
2. Process input/Compress/package frame for network
3. Send frame
4. receive frame at client
5. Display on computer
6. Go back to step 1 and repeat as fast as possible

If there is a good duplicate please post, or if you know a good site/book/video whatever of how it works, please share...