Promap gives you the ability to find Easting and a Northing co-ordinates for any point on your map.
If viewing the VML Raster or OS Detail layers you can also see OS tile numbers and National Grid References for any point on your map in real-time. As you move your mouse cursor around the screen the co-ordinates are updated for you in the Notification Bar at the base of the map.
See Also
To obtain an Easting and Northing for a point on the map
To see grid references in real-time