Accessing bytes in a Word or Dword

From: Marco (donomark_at_tin.it)
Date: 05/17/04 

Date: Mon, 17 May 2004 19:36:00 GMT

Hi

I have to access to the single bytes that compose a Word (2 bytes) or
Dword (4 bytes) and make with these single byte some bit manipolation.

Is there a fast way to access single byte?

Thank you very much for your help

Marco