Presence

Full Title or Meme

For Identity Management Presence typically refers to the human user acting through an agent to access a Web Site.

When discussing the use of the internet by a user, what is really meant is the Presence of the user operating an agent on an internet connection during some sort of Authentication process.
[ ] implicitly means to include Presence, but does not really discuss it beyond the following two extracts from Section 7.
The original Presence test for messaging apps in the 1990's was keyboard entry which could be passed to the correspondent device to show that the user was present.

From the time of the authentication with the agent forward, the user's Presence is seldom verified unless some individual action requires reconfirmation of the user's Presence.

User's physical gesture (touch, swipe, etc) on an input sensor of the device.
Measurement of some biological feature (fingerprint, face scan) of the user.
Sending some message to an alternate communications path (SMS phone message, etc).
Some sort of Turing test (CAPTCHA, etc.)

The process of using one of the above methods to verify the presence of the user, or at least of some human being.

An alternate use of the word Presence is to refer to all of the user's attributes spread across the internet.