I think Julien meant the 'flagged' tag: just press the space bar to
switch it on and off.

Regarding the second question, you may filter your search (e.g., by the
'flagged' tag) and then tag all messages by pressing *. IIRC there is no
shortcut for filtering by default. I have this

(define-key notmuch-show-mode-map (kbd "l") 'notmuch-search-filter) 
(define-key notmuch-search-mode-map (kbd "l") 'notmuch-search-filter) 
(define-key notmuch-tree-mode-map (kbd "l") 'notmuch-search-filter) 

somewhere in my emacs files, but perhaps there is a cleaner way.

> On Tue, Sep 5, 2017 at 1:03 PM, Julien Cubizolles <j.cubizolles@free.fr> wrote:
>> I'm using notmuch.el in emacs. In a notmuch search buffer, how can I:
>
> In general, hit '?' to get a help page for the Notmuch buffer you're in.
>
>> + set or remove the flag mark on a given message
>
> What is the flag mark? There is no "mark" feature.
>
> In the search buffer, you can only operate on threads, not messages.
> Hit '+' or '-' to tag/untag the highlighted thread.
>
> In the tree view (try 'z') you can also operate on messages. '+' and
> '-' work there too.
>
>> + select several messages to add, for instance, the same tag
>
> In the search buffer, select a region of threads to tag, and hit '+' or '-'.
>
> BR,
> Jani.
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