Date: Thu, 13 Mar 1997 19:54:13 -0600 (CST)
From: "Colin W. Glenn" <cwg01 AT gnofn DOT org>
To: "'OpenDOS newsgroup'" <opendos AT mail DOT tacoma DOT net>
Subject: [opendos] IOSYS Magic?
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To those familar with how the kernel works, I got a question:

On Thu, 13 Mar 1997, Mark Habersack wrote:

> On 12 Mar 97 (at 19:08) Colin W. Glenn became famous by saying:
> 
> > > So, you mean like a 'proxy' command.com to uppercase the env and load up
> > > the original one? This might be quite hard with some advanced features of
> > > OD...
> > 
> > How so?  The only potential problem I see is that the stack is undefined
> > upon entry into the command processor, but seeing as you MUST define it as
> > the permanent command shell, you never have to worry about exiting to an
> > unknow machine state.  Them who forget to add the /p switch will need to be
>
> And what about loading the command.com high? If the feature is enabled, then 
> what gets loaded high is the proxy and not the real shell. Also DOS kernel 
> does some magic when starting up a shell - dunno what exactly (yet), but I'm 
> sure that not every program may be a shell (hint: set win.com as the shell)

Does the kernel set anything special up before loading the shell?  Does
the shell have to meet certain requirements to be a shell?  Can a shell
have a preloader which does something before loading the shell?

Inquiring minds need to know!

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