importance of Tigger Price ?

Dear All, Hi Please look the following picture of Kotak KEAT buy form and answer the questions.


http://img231.imageshack.us/img231/1232/orderform.jpg




Q1-What is the importance of Trigger Price field in the above image of Kotak KEAT Buy form?

And
Q2- How to use this trigger field in the buy order form?

when you put stoploss order, trigger price is required. else no use of trigger price. search for "stoploss" and "stop loss" in titles in advanced search.

if its buy order trigger price should be lower than bid price
and higher for sell order

Great Answer because logic Thank you very much you are the first man out of 176 who give a logic answer to me about trigger price in bye/sell order: Amit