I tried to read threads about this matter but some are very old and there are new kernel power releases and decided to ask about the current situation:

Is it possible to use N900 as an external monitor and keyboard for another device?

If yes, by which way of connection?

a) usb port

b) bluetooth

c) wifi

d) some other, what?

I read about usbIP but could not find where did it end and what you could do with it.

I just thought that now that we have very very small usbsticks with whole live distros and raspberries and such that can't it really be possible to run one like that and use n900 just as the screen and keyboard? There are some further questions which will come later.

There are many ways to achieve that. First which comes to mind is indeed setting up IP over USB and then connecting to the target as X server.

Did you check this out?
https://talk.maemo.org/showthread.ph...ight=bluemaemo

and this?
https://talk.maemo.org/showthread.ph...t=hen+usb+mode
newer: https://talk.maemo.org/showthread.ph...&highlight=hen

Why not run a VNC server on the external device and use the N900 to control and view it, I think it is tightVNC viewer in the repos.

Idea was that because it is not possible to add ram or faster cpu to N900 could it be possible to adapt intel stick pc to N900 and run that using N900 as monitor and keyboard? And then make a case for it with a slim external backup battery to give power to it. That is the idea and would like to know is it possible with Palis usb host mode or how?

Now have been checking different computer sticks and it seems that running ubuntu on an intel apollo stick is possible with linuxium ubuntu version. When tried to find instructions running debian I found this https://www.debian.org/releases/stre...apds03.html.en

Thought that someone could be interested. Seems like some good and usefull instructions.

Biketool is correct....TightVNC is a convenient way to achieve the desired effect....if that is indeed the desired effect...
I have used it a lot...

Frankly you aren't really asking "a" question ...pertaining to a specific usage...
But are asking many different ones and each has much diffferent effects in implementation and in end results...

Sure you probably could just use the n900 as a display...
Sure you probably could use the n900 and plug in usb sticks with alt os's...

Problem is...the n900 relies on the usb for power...
Plugging in other things into it..and running goodness knows what ...
Will drain your battery quickly.
Even with bluetooth or wireless mice and keyboards...the battery will drain quick.
Even if you have an octopus of an adapter to try to feed the n900 peripheral devices (mice, keyboards, usb sticks...) and feed it power...
It will still drain...quick (not as fast as without ...mind...but still pretty rapidly..)
To work around that...you would have to find portable os's that use a minimal power footprint ...and also use apps that are minimal as well...and even then...

Frankly ...if using a device for such endeavors ...
I would suggest a n800 or n810...with tightVNC...
Bigger screen....
Usb port AND separate power port.
It is much more viable a usage situation ...than the n900

But that is just my suggestion.

I was thinking the battery myself too. I have understood that N900 charges itself when plugged to a computer with usb at least when you use it as a mass device. But so is it that it doesn't charge when used as a monitor or keyboard? I mean that if the stick computer could be charged from a different port than from which it is connected to a N900 then there could be a charger for that and N900 would be charging itself through the stick computer. That is the way I thought it should work. But if it is absolutely not possible shoot me down before I fly to the sun and get my wax wings melted. I'm not a rich man so dobn't wanna put my money on something which won't carry.

what you want ...is your cake...to eat it too...and refund it as well for the value of 3 cakes...

When utilizing any usb ...as in "mass storage mode" or "pc suite mode" or "usb charging mode"
it doesn't matter if the device is a n900 or any other random device that can do the same thing.

For example....
the nexus 5 and say...
maru os..or...buntu convergence..
with a monitor and bluetooth mouse and keyboard...
utilizing a "slimport" cable that allows connection to the monitor and device...as well as power to the device...
Even STILL...
with power being fed to the battery ...
It is not even a "holding pattern" on battery ...
there is a power drain on the battery...
and that is a very well thought out implementation and usage...

Expecting miracles out of one micro port to be able to handle work loads of data ...connected devices...and keep the battery up...
Is expecting a lot.

That is one of the reasons why I so love the separate power ports on the n8x0s
It allows for heavy work like you are wishing for.

(And by the way ...flying close enough to the sun with feathers and wax ...well...for the wax to get warm enough to melt...you also would most likely have zero oxygen to breathe...and the feathers would most likely catch fire ...turning you into a nice wax candle ...first...
Ever before the wax just melted...
Not really a pleasant way to go...
1- a frozen popsicle before you get there...
or
2- a flaming mass of wax and feathers...when you do get close enough...
either way Daedalus would be laughing ..)

Writing this with my N810, connection over wifi from N900. This feels a great device! I think I can bury my stick pc idea and gonna follow your instruction and find out what I can do with this. Now just feel stupid I didn't buy one more of these when I could have got it for 20 eur.

Exactly.
Just what I have been saying for years...
The n8x0s ARE great devices...
Glad you are beginning to see the light ...

and ..Maemish ...
As my Gran used to say..

The world is full of people who have no problem being hard on you..
So don't be so hard on yourself..

Beating yourself up is just unhealthy ...
and a lot of work...

Let others do it for you...

Any time Maemish ...
I am happy to help.. and beat you up ..
save you the time, effort and trouble ...