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From: ephraim@wang.UUCP (pri=8 Ephraim Vishniac x76659 ms1459)
Newsgroups: net.micro.mac
Subject: Re: System DA
Message-ID: <825@wang.UUCP>
Date: Fri, 13-Jun-86 09:24:45 EDT
Article-I.D.: wang.825
Posted: Fri Jun 13 09:24:45 1986
Date-Received: Tue, 17-Jun-86 20:34:48 EDT
References: <730@pucc.BITNET>
Organization: Wang Labs, Lowell MA
Lines: 15

>   How can you make a DA or a driver exist in the System Heap so
> it doesn't go away between applications?
>  
> -Rob Wald
> (PUCC User Services)
> BITNET: 6090617@PUCC
> UUCP: ...ALLEGRA!PSUVAX1!PUCC.BITNET!6090617
>  
Either with ResEdit or when compiling/assembling/linking, set the
System bit in the resource attributes for all resources used by the
DA (including the DA DRVR itself).  If the DA allocates storage, it
might be necessary to explicitly do so from the system heap.
Some applications (MacDraw) are inimcal to DA's, considering them
merely parasites.  It reportedly closes DA's explicitly, so just
putting yourself in the system heap is no protection.