Yes, SSI (server side includes) are allowed and supported. Note that SSI files must be written with the extension of .shtml in both UNIX and NT environments. We support SSI in both our UNIX and NT platforms. SSI is supported in NT with the exception of the #exec call, which is disabled at the recommendation of Microsoft for security reasons. In our UNIX environment, you may make use of the #exec call, as the security concerns do not exist when running Red Hat Linux with the Apache web server. If you are trying to achieve results that require the #exec call in NT, we recommend you use cgi programs written in PERL. For details on we, PERL, and SSI (including a great listing of script archives), please see:

http://onlinecorp.com/FAQs/faq_cgi.htm

http://www.bignosebird.com/sdocs/execs.shtml