The Default key is E.
I usually change mine to I so everytime I get excited like running away from a stupid mob the inventory screen doesn't come up if I miss the directional keys.
Chat with our AI personalities
The version number of minecraft is in the top left corner On the main menu
Go to the settings menu and search!
When in-game, press escape.
Go to start menu, type in %appdata%, if there is ".minecraft" when you search, then you can. Anyways, why using demo?
A wood plank on top of another in the crafting menu.