Pitney Bowes 4100 Operator's Manual page 23

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31. One-Touch Keys — The keys labeled 01-40 (or 41-80, if you're using
fliptab B) offer one-touch dialing convenience. You also can use the keys
labeled 73-80, if you're using fliptab B, for programmable functions: this
lets you teach your machine an advanced multi-step function just once,
then recall the function at any time by pressing one of these keys.
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