This is a list of hotkeys currently in the game as they aren't listed elsewhere.
1,2,3,4,5,6,7,8,9,0: Used for the quick bar at the top of the screen. In the given order.
A: Opens Area Map.
C: Opens Character Information window.
E: Opens My Pets window.
F: Opens Buddy List.
G: Opens Guild window.
I: Opens Inventory.
J: Sit down on the ground (healing speed doubles, action points recovery rate quintuples)
K: Opens Key Collection window.
M: Opens Magic Crystal window.
P: Opens Production window.
Q: Opens Quest List.
S: Opens Skill Information window.
Enter: Set focus to chat pane's input message box.
Alt + Enter: Toggle full screen mode.