It depends on your server's set up. If it recognizes the 'include virtual' SSI tag, you can see examples of the different SSI calls you can use in the previous forum message "
calling more than one calendar using SSI"
BTW. You shouldn't need to make any of the modifications to the calendar.pl file which are described at that link. They are for older 3.0 versions and Matt has included similar functionality into the current CalendarScript versions.
Dan O.
[This message has been edited by DanO (edited July 27, 2004).]