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Signed scripts use calls to Netscape's Java security classes to request expanded privileges.( like Java signed objects) For example, netscape.security.PrivilegeManager.enablePrivilege("UniversalSendMail")
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When the script calls this function, the signature is verified, and if the signature is valid, expanded privileges can be granted. If necessary, a dialog displays information about the application's author, and gives the user the option to grant or deny expanded privileges.
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Privileges are granted only in the scope of the requesting function and only after the request has been granted in that function. This scope includes any functions called by the requesting function. When the script leaves the requesting function, privileges no longer apply.
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