Symbol Technologies SPT 1700 - Manual (Page 256)

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SPT 1700 Series Product Reference Guide
Look Up Opens a screen, which contains the Address List from your Address
Book. By tapping a selection, you enter that address into the To field of
any message you are creating.
Note: The Look Up command is available only when you are creating a
message.
About Mail Shows version (revision) information for the Mail application.