mining litecoin wallet vs. reaper

[starblazer]

hi everyone!

i am very new to this stuff, so please forgive my ignorance.

i just got "litecoin" wallet downloaded (v0.6.3c-beta) and hit the 'mining' button.  but i am not sure what the difference is between mining through this software...and say, reaper.

it is all basically the same?

i watched this video:

http://www.youtube.com/watch?v=EvhpOQHVZpM

and this dude seems to be using the litecoin wallet app. i downloaded, in conjunction with, say, reaper. 

why would you want to do this if the litecoin wallet app. mines too?

are they different flavours of what is essentially the same deal?

hopefully someone out there can help!

cheers,

starblazer