only authorized users can access the database in enterprise manager in MSSQL Server

hello,

I want to give password when we open the enterprise manager .So that only the authorised users can access the database & see the tables .

Could u help me for solving this problem.
& Also tell me is it posible or not.

very urgent.........reply soonIf user's rights are restricted - he can't do much through Enterprise Manager.
Revoke all unwanted rights from users.|||tell me is it possible that first we enter the login name & password
if it is valid , only that user can see the database.

I want to do...........

If possible then how will be done.