mesg/write/wall

• mesg - A Unix command that allows or denies the ability of other users to write to your terminal.
• write - used to allow people to write messages to each other.
• wall - (an abbreviation of write to all) used to display the contents of a file or standard input to all logged-in users.

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bvi/hexedit

bvi: BVI is a binary visual editor, it allows you to visually see binary values and edit them.

Hexedit: Hexedit is a similar program that show's you the same values in hexidecimal instead of binary.

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Demonstration of the indicated keyword.

Hexedit:

BVI: