The web client was removed many years ago due to support for web java being discontinued in general across the internet.
If you don't have a Jagex Account yet, then you can just launch the client (not through the launcher) and log in normally. The launcher is only required if you have a Jagex Account now.
If you do have a Jagex Account now, then your question would be correct. But one would have to log out and the other person log in, then when they're done log out and the other log back in.
With the future of Jagex Accounts, that wont be as much of a hassle as those using the launcher but with each character as a separate account.
Can I turn in a paper without citing all sources?
"No."[1]
1. William Shakespeare,
Hamlet
, Act III, Scene 1, line 96.
24-Oct-2023 16:08:01