If you tab around a worksheet, your screen reader speaks the coordinates of the currently active cell. This article describes a screen-reader independent way of configuring your worksheet to have row and column titles automatically spoken as you navigate the sheet.
This link points to a web site where there is a free, ready-to-run screen reader that requires no installation.
Read on to find out how you can quickly access your complicated HTML message in your browser when read using Microsoft Office Outlook 2010.
These are links to tutorials and articles on how to use NVDA.