As simple as it maybe I cannot work out how to create a 'Mask'. I have a polygon within which I wish to see the contents of other layers but outside of it I want to mask the data. Can anyone point me in the right direction? ---------------------------------------------------------------------- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]