o.p.c.

So I have some OPC server to pass a lot of data to another app. And this developer is telling me that a "delete" event for a tag is not arriving into that app. So few emails flow back and forth between us, me trying to explain where that bastard event goes, he insisting nothing sort of arrives on his side and it's my server's fault. Until a meeting is set with my manager and his.
Dev: so I have no actual data from your server.
Me: can you seek, please, within your code if struct X is passed on from the server?
Dev: yeah, it appears a lot of times but I haven't seen any instance with your delete event.
Me: ok then, is it any place where you implement the main interface of the OPC client? There is a method in it where all the events are sent. You can put a breakpoint and I cand send you only this event.
Dev: hmmm, I'm looking for it.
[after couple of minutes]
His manager: Dev, did you find that class?
Dev: hmmm, I'm don't know...
His manager: can you add that breakpoint?
Dev: it's not necessary, I can fix it the "delete".