Thanks Walter for your suggestion.
Essentially there are several hundred people from different companies and during the conference, any of them could be called up to stage to contribute. Basically I need to get their name and title into the PIP on screen in the shortest time possible until the finish and the next one comes up.
I envisaged some kind of software where you preload the names in or retrieve from a database then whilst live, you search for the name, double click it and it would send it to the extended/secondary monitor (which would be the main output to the screens). Naturally this is how I could imagine it might work, but there could well be completely different methods out there.
For smaller conferences we have done it in PowerPoint and given each name a slide then had a list of names and their corresponding slide number, however this was with up to 70 odd names as opposed to several hundred (searching a list for a corresponding number out of several hundred i would imagine would be slower than typing the name itself?).