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From: lsr@apple.UUCP
Newsgroups: comp.sys.mac
Subject: Re: multifinder queries & HyperCard annoyances
Message-ID: <6254@apple.UUCP>
Date: Wed, 16-Sep-87 19:00:35 EDT
Article-I.D.: apple.6254
Posted: Wed Sep 16 19:00:35 1987
Date-Received: Sat, 19-Sep-87 06:08:54 EDT
References: <809@newton.physics.purdue.edu> <4060@utai.UUCP> <6209@apple.UUCP> <1365@geac.UUCP>
Reply-To: lsr@apple.UUCP (Larry Rosenstein)
Organization: Advanced Technology Group, Apple Computer
Lines: 24
Keywords: HyperCard

In article <1365@geac.UUCP> daveb@geac.UUCP (Dave Collier-Brown) writes:
>  This is part of the "version problem", and a technique which works
>well is to have a "Capabilities" variable in the program, containing a
>named bit for each capability used, and setting it from a set of constants.

This has been implemented.  Tech Note #129 describes the SysEnvirons trap,
which will give programs information about the system.  The mechanism uses
version numbers on the information records, so it is extensible.  The
first version does not include information about Multifinder (since it
hadn't been released at the time), but I would expect that future
SysEnvirons version will include that information.

MacApp 1.1 has its own capabilities record, which is automatically filled in
when the application starts up.

-- 
Larry Rosenstein

Object Specialist
Apple Computer

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