window = Window:Create()
context = Context:Create(window)
while true do
if window:Closed() or window:KeyHit(Key.Escape) then return false end
context:SetColor(0,0,1)
context:Clear()
--Draw a rectangle on the screen
context:SetColor(1,0,0)
context:DrawRect(100,100,context:GetWidth()-200,context:GetHeight()-200)
context:Sync()
end