Needs Help on levels

How Level of support and resistance is calculated for shares ?
Which method is used for calculation ?
Can any one Help me on this mattaer

HI

Want to learn about Support & Resistance
view this link:http://en.wikipedia.org/wiki/Support_(technical_analysis)

Pivot points are frequently used by foreign exchange traders as a means to calculate resistance and support levels which are, in turn, used as visual cues to execute trades.
View :http://en.wikipedia.org/wiki/Resistance_and_support_calculations


Regards,
Luckytrader.

luckytrader,
thank you for this excellent site.thanks again million

Thanks a lot to LuckyTrader