If you have properly set up your ssh keys, you can use cron on one site to ssh into another one at regular intervals and run a script on it. (Btw, this doesn't have anything to do with Perl - as the answer would have you guess.)
Thank you for replying to my question.
I had not heard of ssh before; now I have researched it a little, I am frightened to try any contact with the host servers other than ftp and using a standard web browser.
I have not found anything within Perl to access other sites except redirection ( print redirect ), but as I seem to discover something new every day, I thought there may well be lots of commands just waiting to be used!
I guess I was hoping access would be the same as from a browser.
Thank you again for your trouble.