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From: Jim.Matthews@dartmouth.edu (Jim Matthews)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Protecting apps on networks
Message-ID: <24015@dartvax.Dartmouth.EDU>
Date: 31 Aug 90 12:57:41 GMT
References: <15105@csli.Stanford.EDU>
Sender: news@dartvax.Dartmouth.EDU
Reply-To: Jim.Matthews@dartmouth.edu (Jim Matthews)
Organization: Dartmouth Software Development
Lines: 22

In article <15105@csli.Stanford.EDU>, francis@csli.Stanford.EDU (Dave Francis)
writes:
> I need information about how to protect my application from being run
> multiple times on a network. The behavior I'm looking for is seen
> in 4th dimension where you can't run more than one application at
> a time on the network unless you buy more than one.

The behavior exhibited by 4th Dimension isn't something that any network
administrator is looking for -- 4D floods every zone of an AppleTalk internet
with broadcast packets, which translates to bothering 6,000 computers on
a network like ours.  If you want to be sure that only one copy of a program 
is running on an internet you should think about having a central server 
that the application registers with.  In fact, such a system (called the
KeyServer) is available from Sassafras Software (603-643-3351, or 
denisd@dartmouth.edu for e-mail).  I believe that the University of Michigan 
has a similar system called LaunchBreak.

Jim Matthews
Dartmouth Software Development

Disclaimer: The developer of the KeyServer is a colleague of mine.
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