SURE- GALD TO--It is the amout of shares that are located on the bid and ask prices. Not just the current bid and ask-ALL of them.
Higher and lower
It is a VALUABLE TOOL for trading. do you have Tdameritrade?
L2 is free. Some other brokers might charge a fee or have a minimun balance.
Normally if you ASK someone(on the board) the L2 info-they will post it, for someone that asks.
I will send a link next-L2 is actually LEVEL Two

http://www.investopedia.com/articles/trading/...quotes.asp

http://www.advfn.com/Help/what-is-level-2-dat...;source=cj

there is also a additional link for information on the second link.
let me know if you need additional info--always happy to help!!