I need to find the area of memory that contain the SCREEN display (KermM says its gbuf). Where is it in Axe? And how do I access it in Axe?

L6 is gbuf, L3 is appbackupscreen (or the backbuffer)

Personally I don't use copy...

I would do:
For(A,0,767
{L6+A}->{P+A}
End[code]

and to copy to the screen (I don't use bitmap either >.>)
[code]Fpr(A,0,767
{P+A}->{L6+A}
End
DispGraph[/code][/code]

look at this maybe,

I would use copy personally, it's much faster. If you absolutely don't want to use copy, though, then don't update the LCD every few bytes like in http://www.omnimaga.org/index.php?action=dlattach;topic=4688.0;attach=3608

To copy a appvar's picture to the graph buffer, yes you would do:
conj(P,L6,768)
To display it, you simply use DispGraph.  That's what DispGraph does, it just copies the main buffer to the LCD.  No need to bitmap anything.

Alternatively, if you just need to show a picture and don't need to actually copy it to the buffer, you can just do this instead:
P->DispGraph
That will copy the 768 bytes in P to the LCD directly and not touch any of the buffers.