   How to use dual monitor
  Hi all,I want to know how to detect dual monitor on a PC, and how to separate an application to be displayed on the monitors, i.e. a 3D display on one monitor, and Windows forms on the other monitor. Any idea please let me know.Thanks a lot. 
  The GetAdapterCount() in the IDirect3D9 interface returns how many adapters (or graphics devices) there are available.  So, if''s it''s more than one, the user has more than one monitor.CreateDevice()''s first parameter asks for the adapter ordinal number.  This is how you can select which monitor you want to use.    Dustin Franklin   Mircrosoft DirectX MVP ;  Thanks circlesoft.I''ll try that. ;  and what about new cards that can run two monitors u won''t know since u''ll get one adapter (check msdn there ''s some windows api functions that manages multi-monitor systems) ;  For Direct3D and DirectDraw you''ll get 2 adapters for dual-head cards. 