I seem to have 2 viewports whilst in modelspace (Tilemode 1), each view has the same information and if i modify the one view the other modifies automatically? - Any ideas
TILEMODE=1 VIEWPORTS are probably the most under-used tool in the software. IF you're doing 3D work pull-down VIEW->VIEWPORTS->NEW VIEWPORTS (be sure to click the little "3D" box at the bottm.