How does a stack know it's been opened from a cgi?

[Ken Ray]

Hi, I have a library that I want my CGI to 'start using', but it is
important that the library know whether it is being loaded from a CGI, or
whether it's being loaded from a "normal" stack.

What can a stack do to test whether it's being loaded from a CGI or not?

Ken Ray
Sons of Thunder Software
Web site: http://www.sonsothunder.com/
Email: kray at sonsothunder.com