Date: Sun, 9 May 1999 17:36:33 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Mohamed Saad <bazramit AT yahoo DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: __tb?? what is it for?
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On Sun, 9 May 1999, Mohamed Saad wrote:

> 	what is __tb? i know it is a macro substitution for
> some thing ( and i saw it in info!). but... what is
> its use??

For an explanation why is the transfer buffer needed, see 
http://www.delorie.com/djgpp/doc/eli-m17n99.html#Library

> 	is it just some amount of free dos memory? and i can
> just use it freely for my own purposes?

Yes to both of the above questions.  For more details see section 18.2 of 
the DJGPP FAQ list (v2/faq211b.zip from the usual DJGPP sites).

> what is its size?

The size is stored in _go32_info_block.size_of_transfer_buffer (declared 
in <go32.h>).  It is usually 16KB, but it can be changed with the 
stubedit.exe utility.