while true do
        if window:Closed() or window:KeyHit(Key.Escape) then return false end
                
        context:SetColor(0,0,1)
        context:Clear()
        
        --Draw some text centered on the screen
        local text = "Hello!"
        
        local font = context:GetFont()

        local x = window:GetWidth()/2
        local y = window:GetHeight()/2

        x = x - font:GetTextWidth(text)/2
        y = y - font:GetHeight()/2

        context:SetBlendMode(Blend.Alpha)
        context:SetColor(1,1,1)
        context:DrawText(text,x,y)
        context:SetBlendMode(Blend.Solid)

        context:Sync()
end