Very Useful Search Function in Browser Mode for organising a photo collection

[zzapper]

Hi
I've only just discovered how useful the search function is in browser mode.
I can enter a simple string e.g. bridge
or a regexp img.*21.*111[1-7].*

I can sort by size date extension etc etc.
I can also filter by various tags

Now here's the kicker:
In browser mode I can select several of the photos I wish to work on and then from the right mouse button menu select 'Open All Selected'
and those images open in separate tabs in xnviewmp.

I wish I'd know this earlier so my question is where can i learn more tips, there doesn't seem to a be forum for that?