From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@cse.psu.edu
Subject: Re: [9fans] was 8½ slow and that lead to rio?
From: okamoto@granite.cias.osakafu-u.ac.jp
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Date: Thu, 31 Jan 2002 13:10:17 +0900
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>No programs in the standard distribution use them directly.
>Are you?

Yes, we are using those for making layer structure in our program
where we need a base layer of image, which shouldn't be affected
through changing other layers for showing tentative information,
such as showing alititude data pointed by the mouse, or for making
some anotations on the image etc.  If we don't have such a layer
structure, we have to redraw the base layer everytime we made and
erased such tentative informations.

Kenji