XnView Software

This sounds as a real newbie question, I agree.

But eh ..
what is the hotkey for just 'Save' (not save as) - I have this 'Save' button in the toolbar but would like to use a hotkey.

If there is none, how to assign a hotkey to this?
( I don't see an option within toolbar configuration)

Thanks!

you can add a hotkey in settings>Interface>Shortcuts

Under Windows I am using <Ctrl>-S, which also is showing in the menu "File" and item "Save Ctrl-S".
And I am quite sure this is default behaviour and I haven't changed my settings for this.
Using XnView MP 0,89
Regards, Thomas