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ashokdddashokddd 

want to know about role,role hirarchy,sharing rules and owd?? thanx in advance

Deepak Kumar ShyoranDeepak Kumar Shyoran
Following are some useful link which will help you to understand topics mentioned by you.

http://www.shellblack.com/whiteboard/security-owds-sharing-rules-and-the-role-hierarchy/
http://sfdctopics.blogspot.in/2012/05/sharing-rules-in-salesforcecom.html
http://salesforcecafe.blogspot.in/2012/11/owd-in-salesforce.html

Please mark it as best solution to your problem if it does solve your problem.