Look in the Door help for Event.Data. That's got the EventArgs for the event in it. Google for its members.
B4X:
Sub KeyPressEvent_NewEvent
o.Value =KeyPressEvent.Data 'Get the event's KeyPressEventArgs
KeyChar = o.GetProperty("KeyChar ") 'Returns the character
End Sub
You will get more information from the KeyUp or KeyDown events which return a KeyEventArgs object - more Googling