In this tab, add or delete a mapping between logins on the local instance of SQL Server and remote logins on the linked server.
Local Login
Choose a login on the local server.
Impersonate
Check this option to specify that logins use their own credentials to connect to the linked server.
Remote User
Enter the username used to connect the linked server.
Remote Password
Enter the user password.
Set the action when a login not defined in the list:
not be made
be made without using a security context
be made using the login's current security context
be made using the following security context:
Set the Remote login and Password