Windows 7 Credential Manager stores logon user names and passwords for network resources such as network shares, web sites and terminal services, and allows you to back up, restore and manage saved credentials. Credential Manager stores these details in the Windows vault. In addition you can back up the Windows vault on one computer and restore it to another computer. When you opt to save your credentials by checking the Remember my credentials checkbox in Windows Explorer, Remote Desktop Connection or in Internet Explorer, the Credential Manager kicks in and stores these entries in the Windows vault.
The Runas command is a great command-line tool that gives you the capability to run applications using the credentials of another user but watch out as you may be compromising security of the Windows 7 system. For instance, with the Runas command you can allow a standard user on a Windows 7 system to run applications that require administrator privileges.