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(gnus)Slave Gnusae

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Slave Gnusae
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   You might want to run more than one Emacs with more than one Gnus at
the same time.  If you are using different `.newsrc' files (e.g., if you
are using the two different Gnusae to read from two different servers),
that is no problem whatsoever.  You just do it.

   The problem appears when you want to run two Gnusae that use the same
`.newsrc' file.

   To work around that problem some, we here at the Think-Tank at the
Gnus Towers have come up with a new concept: "Masters" and "slaves".
(We have applied for a patent on this concept, and have taken out a
copyright on those words.  If you wish to use those words in
conjunction with each other, you have to send $1 per usage instance to
me.  Usage of the patent ("Master/Slave Relationships In Computer
Applications") will be much more expensive, of course.)

   Anyway, you start one Gnus up the normal way with `M-x gnus' (or
however you do it).  Each subsequent slave Gnusae should be started with
`M-x gnus-slave'.  These slaves won't save normal `.newsrc' files, but
instead save "slave files" that contain information only on what groups
have been read in the slave session.  When a master Gnus starts, it
will read (and delete) these slave files, incorporating all information
from them.  (The slave files will be read in the sequence they were
created, so the latest changes will have precedence.)

   Information from the slave files has, of course, precedence over the
information in the normal (i.e., master) `.newsrc' file.