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From: Eli Zaretskii <eliz@is.elta.co.il>
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Subject: Re: display-pixel-height not working as advertized
Date: Tue, 9 Apr 2002 10:43:53 +0300 (IDT)
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On Mon, 8 Apr 2002, John Wiegley wrote:

> (display-pixel-height "some.host.com:0.0") should return the X display
> height in pixels.  Instead, it always returns my own display's height
> in characters!
> 
> This seems to be because (framep-on-display "some.host.com:0") always
> returns nil.

Thanks.  Could you please step through frame-on-display and its 
subroutines, and see why does it return nil?