When your friend asks you - how do I play the chord, say Bb, on my ukulele -- you can go here, enter the name of the chord, finger positions and (optionally) which fingers he/she should use, then press 'Submit' and send the resulting link to his/her email address... Or paste it into a forum post. Or an instant messenger...
Have fun! (dyslexics - have fnu!)
other examples:
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