Can I use this method to use a shared connection or a connection name already stored in the .dbc?Sure. You can use *any* connection handle with connstring.
IMHO it's a great idea to use all RVs with CONNSTRING. Then you can remove the connections altogether from the dbc, you can include a "views" dbc inside your app which means each user is using their own copy => no dbc contentions and no problems with dbc versioning etc, and if you use SQLStringConnect() for your connstring, you don't need to set up odbc datasources on user machines any more.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
