Applying for articles in big 4 - procedure??

Hi friends,

I've appeared for may'11 ipcc - both groups. and wanted to know the procedure for applying in big4 for articles.

I've heard that the interviews r conducted even b4 the results r announced. Please help me out on this & give me all the details starting from application till the interview process.

Also, please guide me as to which one o' d big4 is the best as regards the treatment,pay and overall rating.