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In game Key Shortcuts

General

X + Left Click - Quick sell items
H - Opens Wiki in browser

 

Horse

CTRL + H
CTRL + G
- mount / unmount
CTRL + B - send horse away
U - horse interface window

You can also use the horse image to directly mount/unmount by puting it in the 1-4 or F1-F4 slots.

 

Voice chat

Y - toggle voice chat
CTRL + Y - voice chat settings