It is always something to aim for but with anything time always catches up. I would say if it is anything internet or connectivity wise externally in any form

It is always something to aim for but with anything time always catches up. I would say if it is anything internet or connectivity wise externally in any form comm wise, then you have to plan for maintenance from a security and protocol changes aspect over time (thinking transaction data formats). So if security not an issue or removed from the project via some wrapper be that system locked in a room with control and other layers. Then you still have to plan for how long it is meant to last and being realistic. WIth most business assets your talking 5 year write off at best tech wise with many 3 or maybe less, depending upon use. SO possible - in the right situation - yes. But do not forget security. THough remember time always a factor and also wear and tear and with that a pen eventually runs out of ink and required refiling. So dependant upon the timeframe doable but for many at what cost. Another aspect would be look at what you have got that has fulfilled this criteria and not required maintenance and then ask, were you lucky or did you plan it that way as for many it usually ends up as some legacy system, hardly anybody uses or with low usage that has no internet connectivity at all. That is when you see your Amiga or C64 or early PC working away without issue. But things fail and however well you plan things, things happen and to not at least check everything working and monitoring because it was designed to just work is something you should also plan. Expect the unexpected.