Inw()

         Reads a word from a hardware port

    Syntax:

         Inb( nPort ) -> nValue

         nPort : System port

    Description:

         DANGER!!
         This function allows low level access to system. It should be used
         with extreme care and requires a through knowledge of computer
         Architecture.

    Return:

         A numeric value received from port.

    Example:

         nValue := Inb ( 256 )  // Recogo un valor del puerto FF