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From: Hrvoje Niksic <hniksic@srce.hr>
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Subject: Re: Process-marking all unread articles
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Kai Gro-Aß-Bjohann <Kai.Grossjohann@CS.Uni-Dortmund.DE> writes:

> Does it work to narrow the buffer to the articles marked with SPC
> first?
> 
> / m SPC RET

This helps, thanks.  Now I can do the required operation with
something like `/m SPC RET M P b M-& !' optionally followed by `/w' to 
pop the process mark set.

But now I've gotten all cocky and would like to make the thing be a
Lisp function rather than a keyboard macro.  In that case `/m SPC RET' 
is replaced with a simple (gnus-summary-limit-to-marks " "), and `M P
b' with (gnus-uu-mark-buffer).  However, I don't know how to emulate
M-& followed by a command.

Is there a way to do what M-& does, but from Lisp, i.e. iterate
through process-marked articles in a way?