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Can I limit a Table to only one record ?

Can I limit a Table to only one record ?
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Have problem with operators entering dates as I cannot put input masks into the dialog boxes when they ask for a date.

So I decided to have a Table [DateFromTo] with two fields (Obviosly DateFrom and DateTo).

All OK, but wandering fingers always find an error in this sort of thing and as I need the DateFrom and DateTo to use as criteria in subsequent queries and reports I want to make sure there is only one of each.

That is, I want to prevent the operator from being able to accidentaly open a second (new) record in the table and then inputting another pair of dates.
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