Portal-2 Info

In co-op mode, you can use text chat by pressing the "T" key to type messages directly to your partner.

Exploring the "text" elements of Portal 2 involves everything from the game's actual writing and typography to the technical ways developers and modders manipulate text in the Source engine. portal-2

To help with accessibility or for those without sound, Portal 2 offers closed captions and subtitles. These can be enabled in the Audio tab of the Options menu. In co-op mode, you can use text chat

The game uses game_text entities within the Hammer editor to display floating or view-relative text, such as chapter titles and level transitions. Visual Style & Typography In co-op mode