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Back when IBM PCs first came into use we began using them as visual interfaces for operators to control industrial process plants. PCs were new and few people knew how to use them very well. On the control systems I designed I kept an exact copy of the software on my office PC as the one in the field so I could walk through any changes with the field personel.
On one plant's system you had to hit the F10 key in order to compile after any changes were made. I was working on the phone with one of our startup engineers making a small change and when we were done I instructed him to hit F10 and we were through. We went through this 3 or 4 times and each time after hitting F10 he would say nothing is happening. I even had him load the software from scratch but still nothing.
After about an hour of this I said "It's working perfectly on my system so let's try again". We reloaded and I told him now make sure you hit F10 when your through. The startup guy said "Damn it, it just doesn't work but here goes, F, one, zero". After I explained I meant function key 10 all was well.
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