Building Security for a client based application

Hi All…

I would like to get some help on how to build a security around a Client based Application. I would like to set up the security to pertaining client for specific documents. For example, when a client logs in, he/she should be able to see only their information, nothing but their information. all the forms, views and etc are developed allready. Now is the part of setting up the security. So can someone help me how I could get around this security issue. If anyone have information on setting up security for a client based application, please let me know as soon as possible.

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