stopping less command from garbaging on the screen

[Krishna Mohan Gundu]

Hi,

When less exits the entire page history of the less session remains on
the screen. How do I prevent less from doing that?

Also are you aware of any articles on the web that summarize the
behavioral differences like these between linux and freebsd. I have
come across the command equivalences between the two but not
behavioral differences.

thanks,
Krishna.