Command: open_dll
  
Platform: 
  WIN32 , Linux
  
Syntax: 
  a = open_dll(s)        
  
Description: 
  Open a dynamic link library (.dll or .so) file. A 32-bit address will
  be returned, or 0 if the .dll or .so can't be found. s can be a relative
  or an absolute file name. Windows will use the normal search 
  path for locating .ddl files. Linux search in ld_libary path
  
Comment: 
  The value returned can be passed to define_c_proc and 
  define_c_func.
  
  You can open the same .dll or .so file as many times as you like.
  No extra memory is used and you'll get the same number returned
  each time.
  
Example: 
     atom user32
              user32 = open_dll("user32.dll")
              if user32 = 0 then
                puts(1, "Couldn't open user32.dll!\n")
              end if
 
See Also: 
  define_c_func, define_c_proc
  
