Well, there's a couple approaches to it. With Cerveza's GBOT, it was a client/server kinda thing so really there was only one "client" which the bot would interact with.
From what I see with you, you'd like to "service" any number of people who might show up. So I'm guessing that you'd want to be scanning guild chat? Whispers? Anything journal related should have some safeguards to keep people from setting off your bot and determining that you are a cheating mangy scripter.
Either way, it's pretty easy to determine what the #FINDID is from the incoming text. Really, you need to:
1) Determine if spamed command is from a valid "''customer"
2) Scan within range for valid people #FINDTYPES, and event property them. The first part in the #PROPERTY (separated by $) should be the character name. Compare that to what showed up in the #JOURNAL request.
3) If that matches, then do your stuff, res, heal, cure, moon, whatever.