doubts about fix

Imported from previous forum

hi i have few quaries about the quickfix protocol. 1. i want to know about the complete new order single flow which means after sending new order single message,how will it travel (like first single order message is sent to server then how the server will send what type of execution report and in which sequence of order status(i.e tag 37 = new,partially filled,filled,done etc.) ? and wheather executed quantity is allocated through fix protocol or not. 2. What is cross orders and multileg orders???Where and how do we use it??? 3.What it tag for Basket order.(Basket order is the trading of many numbers of stocks, usually more than 10, with a single order entry.)