It is possible to pass a particular connection as a parameter when using an include:
<INCLURE{fond=recent_articles}{connect=demo.example.org}>
[(#INCLURE{fond=recent_articles, connect=demo.example.org})]
An include does not automatically pass the parent connection: to propagate a connection, you need to specify it as a criterion in the include itself:
<INCLURE{fond=recent_articles}{connect}>
[(#INCLURE{fond=recent_articles, connect})]