CreateGraphics without a backbuffer?

Take a look at this:

SetGraphicsDriver   GLMax2DDriver(),0
Graphics( 800, 600, 32, 60, 0)
HideMouse()
MoveMouse GraphicsWidth()/2, GraphicsHeight() / 2

Local OldMouseX:Float = MouseX()
Local OldMouseY:Float = MouseY()
Local newmousex:Int
Local newMousey:Int
Local t:Int, temp:Int
Local Before:Int=MilliSecs()
Local RightNow:Int
Local fps:Int
Local AFPS:Int,ACount:Int=0
Local Effect=0 

Cls

For t=0 To 100
	SetColor Rand(0,255),Rand(0,255),Rand(0,255)
	DrawRect 20+t*4,20+t*4,100,100
	SetColor 255,255,255
	Plot t,t
	DrawText "test",t*4,t*4
Next


While Not KeyDown( KEY_ESCAPE)
	If KeyDown(KEY_SPACE) Then effect=1-effect
	SetColor 0,0,0
	DrawRect OldMouseX ,oldMouseY,20,20 'cleaning up after the mouse
	SetColor 255,255,255
	newmousex=Int(MouseX())
	newMousey=Int(MouseY())
	SetColor 255,255,255
	DrawRect NewMouseX ,NewMouseY,20,20
	SetColor 155,25,2
	DrawOval newMouseX ,newMouseY,20,20	
	If effect
		For t=0 To 2000
			SetColor Rand(0,255),Rand(0,255),Rand(0,255)
			Plot Rand(40,600),Rand(40,500)
		Next
	Else
		For t=0 To 2000
			SetColor Rand(0,255),Rand(0,255),Rand(0,255)
			DrawRect newMouseX+30+(t/10) ,newMouseY+30,20,20
		Next
	EndIf	
	OldMouseX =newMouseX
	OldMouseY =newMouseY
	
	RightNow=MilliSecs()
	temp=RightNow-Before
	If temp<1 Then temp=1
	FPS=1000/temp
	Before=RightNow
	ACount=ACount+1
	AFPS=(AFPS+FPS)/2
	If ACount=100
		ACount=0
		SetColor 0,0,0
		DrawRect 20 ,20,40,20
		SetColor 255,255,255
		DrawText afps,20,20	
	EndIf	
	Flip 0 'Has probably absolute no meaning(does Nothing?) 
Wend
EndGraphics

Perhaps it's dirty and not save? because I have no knowledge of GraphicsDrivers whatsoever.
But it "seems" to work.