As of September, 2015, here are all articles on Larry's site which have 4 practice Vubridge deals available:
Abbreviation for A system to ask for not only the 4 aces, but the trump king as well Roman Keycard Blackwood rkc">A system to ask for not only the 4 aces, but the trump king as well Roman Keycard Blckwood
A convention to interfere against a 1NT opening dont-give-up8">Splntr Bids