We can include one file in another with the include command:
<!--#config errmsg="Bungled again!"--> This is some text in which we want to include text from another file: << <!--#include virtual="another_file"--> >> That was it.
This produces the following response:
This is some text in which we want to include text from another file: << This is the stuff in 'another_file'. >> That was it.
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