At first, when you viewed the spreadsheet, you saw a richer interface that:
(1) popped a little message when others started viewing, with their logged-in Google username
(2) offered an expandable chat sidebar
(3) showed each others' active selection-area via different selection colors (correlated with colors in the char sidebar)
The warning was fair but it was actually kind of interesting. I think the best case mixing fairness-of-disclosure and options-to-viewers would be a link to the static doc, but another link on the static doc allowing upgrade to the interactive interface (perhaps with a hint of what you'll see and reveal if doing so).
Dug up from my browser history, this was the original link, which reveals your logged-in Google username to other simultaneous document viewers:
(1) popped a little message when others started viewing, with their logged-in Google username
(2) offered an expandable chat sidebar
(3) showed each others' active selection-area via different selection colors (correlated with colors in the char sidebar)
The warning was fair but it was actually kind of interesting. I think the best case mixing fairness-of-disclosure and options-to-viewers would be a link to the static doc, but another link on the static doc allowing upgrade to the interactive interface (perhaps with a hint of what you'll see and reveal if doing so).
Dug up from my browser history, this was the original link, which reveals your logged-in Google username to other simultaneous document viewers:
!!! http://spreadsheets.google.com/ccc?key=rC4oeGjG_04iG63oBJvy2...