• FileLength(name:PTR TO CHAR)(LONG)
  Returns length of file specified by $lt;name$gt; or -1 if file doesn't exists.
  
  
• Inp(fh)(LONG)
  Returns byte read from file handle specified by the <fh> or -1 if an error occured.
  
  
• Out(fh,byte)
  Writes <byte> to file handle specified by the <fh>.