Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!hplabs!hp-pcd!hpcvlx!bturner
From: bturner@hpcvlx.cv.hp.com (Bill Turner)
Newsgroups: comp.windows.ms
Subject: Re: How does Excel do cells
Message-ID: <106580073@hpcvlx.cv.hp.com>
Date: 6 Dec 89 19:40:39 GMT
References: <49529@ccicpg.UUCP>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 14

> On further reflection, I hope that the designers of Excel made no assumptions
> as to the max resolution and size of the display device, and therefore cannot
> know the max number of cells that Excel might be called upon to display at 
> once. Given the absence of virtual memory and the generous 640K limit, I don't
> think each cell is a window.

Actually, it's even worse than that.  When a window is created, a data structure
of non-trivial size (I don't know exactly how large) is allocated from a single
64K segment, which is also used to allocate class structures from.  (HINT:  This
is why you shouldn't register window classes with large cbClsExtra or cbWndExtra
values)

--Bill Turner (bturner@hp-pcd.hp.com)
HP Corvallis Information Systems