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 scrndriver()        Return current screen driver identifier
------------------------------------------------------------------------------
 Declaration
   screen.hdr

 Syntax
   func uint scrndriver extern

 Arguments
   None.

 Return
   A numeric identifying the current screen driver, as listed in the
   table below.

   Id | Screen driver
   ---+--------------
   0  | scrndirect()
   1  | scrnbios()
   2  | scrndos()

 Description
   This function returns the identifier of the current active screen driver.

 Example
   #define EXAMPLE_SCREEN
   #include example.hdr

   proc Test_scrndriver
   ? scrndriver()          // 0 (default)
   wait
   scrnbios()
   ? scrndriver()          // 1
   wait
   scrndos()
   ? scrndriver()          // 2
   wait
   scrndirect()
   ? scrndriver()          // 0
   wait
   endproc

   proc main
   Test_scrndriver()
   endproc