How can I enable "Run as" in Windows Vista?

A. For some shortcuts in Vista, if you hold down the Shift key while right-clicking the target, a "Run as" option will appear in the context menu. To select the credentials to use for any elevation in privilege--for example, for those items that don't display a 'Run as' option--you can have Vista prompt for credentials rather than simply elevating them. To do so, start the Group Policy Editor (gpedit.msc) and navigate to Computer Configuration, Windows Settings, Security Settings, Local Policies, Security Options. Double-click "User Account Control: Behavior of the elevation prompt for administrators in Admin Approval Mode." Change to "Prompt for credentials," and click OK. You can also perform this configuration as part of a domain-wide Group Policy from a Vista client by setting the same value at the same location in the Group Policy Object (GPO).