When you engage with a client who uses your solution, sometimes they want to trust you with everything. Under normal circumstances, we would refuse, but because of our office in Asia, we can create a self-contained software support unit for 3rd-party applications that doesn’t interfere with mainstream activities. So, it’s a win-win all round and who knows? – we may get another client onboard.
Sometimes the code has no documentation, sometimes it’s written in a language and environment that is no longer supported. But it always comes to us when the client has hit the ceiling. So, the division that handles 3rd-party application support is adept at pulling rabbits out of hats.
When all else fails, we sometimes patch it up temporarily while we wave a magic wand and rewrite the source code.
The more detail you provide, the better we can understand your requirements and respond appropriately.