"Jason Travis" wrote in message
...
(Thank all of you for the responses to my older cat problems.)

The other three are younger and regularly go outside. I'm the obliging
doorman for them more often than not.

Problem is I've accidentally reinforced a distressing behavior. When they
were little they would climb on the outside screens for fun. This of
course brought me out the door. So what they've learned from this is if
they're outside and want to come in, they pluck the screens to alert me.
One screen has been nearly destroyed, the others they don't seem to abuse
as much.
[snip]

You might want to have a look at Phifer's 'PetScreen' product.
http://www.phifer.com/petscreen.htm