Hiding Windows Desktop or Locking Windows Dekstop

Hi, I am raaj, working as a programmer in Malaysia.
Right now I am developing an Internet Project in Java using Swing and Access Database. Actually our requirement is, when the system starts, automatically Java Application have to run(this can be done), after that, the application window have to be shown. Currently the Java Swing Application is focussing. From that application, the user is entering username and password, if the username and password is correct then only the user can access the windows desktop previlages or any other resources in the operating system, before that we should not give the rights to access these previlages. If any body gets this: please mail immediately to
[email protected]

actually, I want to Lock windows desktop using Java Application. can u plz find the way that, how to do this. that is when the java application starts, the focus should be on the application, if the user data fills correctly, then only the application should the user to access windows previleges like my computer, network neighbourhood,or any other resources, If the user don't enter data properly, then the application should not allow the user to access windows previleges.

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