Symbol PDT 8100 Series Product Reference Manual page 145

Applications
Messages that you receive directly from an e-mail server are linked to the e-mail server
rather than the desktop computer. When you delete a message on the terminal, it's also
deleted from the e-mail server the next time you connect.
You can work online or offline. When working online, you read and respond to messages
while connected to the e-mail server. Messages are sent as soon as you tap Send, which
saves space on the terminal.
When working offline, once you've downloaded new message headers or partial
messages, you can disconnect from the e-mail server, then decide which messages to
download completely. The next time you connect, Inbox downloads the complete
messages you've marked for retrieval and sends the messages you've created.
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