Excerpts from Tony Li on Fri, Apr 17, 2009 10:31:44PM -0700:
>
>>> - stable, at discretion of owner
>>
>> I'd say: must have a defined lifetime, set by the owner, which may be 
>> infinite.
>
> I like this.  How about: "... and can be terminated at any time at the  
> owner's discretion."

In actual use the owner may have committed to a minimum duration.
Brian's phrasing is better imho.

>>> - unambiguous
>>
>> I'd say: must have a defined scope within which they are unique and
>> unambiguous.  The scope may be universal. [Now define 'universal'.
>> It's not so easy.]
>
> How about 'global' instead?
>
> Do we really want local identifiers?

Let's not assume too much about solutions.  Everything has scope.  
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