>In a form, i do REPORT FROM.... and the printer is not ready, so VFP launch "Printer not ready" error, then i in Error Event, look it in the database, and show "Hey man, the printer is not ready, please connect it and push the POWER button bla, bla, bla"

That's what tech support is usually for. I don't know of any such DB.

But if you have a common problem like that, you can build into your app a MessageBox with a brief explanation of instructions for the user to do - that's typically what I do, anyway.