Embedding Emacs in other apps

[Tassilo Horn]

Hi all,

I've wondered if it is possible to embed emacs in other applications, so
for example that I can edit textfields in my browser using emacs.  I
quickly found this NEWS entry for emacs 23.

,----
| *** Emacs now supports the XEmbed specification.
| You can embed Emacs in another application on X11.  The new command line
| option --parent-id is used to pass the parent window id to Emacs.  See
| http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
| for details about XEmbed.
`----

But this --parent-id option is only available to emacs, not emacsclient.
Is that intended or technically not feasible otherwise?  My emacs needs
about 20 seconds to start, but I always have a server instance in the
background.  Clearly, I wouldn't want to wait 20 secs to start editing
some textfield, but simply embed a new frame...

The --parent-id option isn't documented in the texinfo docs, btw...

And the other thing: Is there some example code showing how I can embed
emacs in my own application?

Bye,
Tassilo