Comment 20 for bug 328575

One other thing I wanted to mention here is that for non-local applications, metacity actually suffixes their title with "(on $hostname)". I think it should actually go further and have a differently-colored border to more strongly emphasize "This application is not local" with the implication that it may not behave as you might expect (for a variety of reasons, among them that it's not able to talk to the local session bus).

Similarly for applications run under sudo, especially for applications running as uid 0, metacity could draw e.g. a pulsing red border.

While this may sound like crack at first, remember that essentially only sysadmins (or people acting under the direction of one) are going to end up in either of these situations, so having a weird border a good thing, since something weird is going on.