"Heavy price to pay" is good advice in the commercial sector.
Here, how critical is it. exactly?
There are two issues about multiple users trying to update the same record.
Either you can set the Access database so that only one person at at time can use it. (Not shared) This way, the problem does not arise.
Or, what happens is that the second person to save changes 'gets the prize'.
(The first set of changes are lost)
What exactly is at risk? Names and addresses? If so, the chances of concurrency are small, and it is to be hoped that the changes would both be to the 'correct' new values'.
If its a list of (say) books read, then the items you are writing should be additions to a linked table, and wont clash.
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