Challenge 1: Two People Typing Simultaneously — Solution Walkthrough

Setup: a Google Doc shared with a second account, both people open it
at the same time and type in different sections simultaneously.

What each person sees:

Each person sees their OWN typing appear normally as they type it,
exactly as if working alone. At the same time, they see the OTHER
person's cursor — a distinct coloured marker with that person's name
attached — actively moving through the document and new text
appearing at that cursor's position, live, character by character, as
the other person types. Neither person needs to refresh the page,
reopen the document, or take any action at all to see the other
person's changes; it simply appears in real time on both screens
simultaneously.

WHY THIS WORKS AS AN ANSWER
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This is the direct, hands-on confirmation of this chapter's own
central claim: because both people are connected to the exact same
live cloud object (Chapter 1), rather than two separate copies, each
person's edits are visible to the other essentially instantly — not
after a save-and-reopen cycle the way two people working on separate
copies of a Word file would require.