Suppresses the welcome pop-up that appears when logging in. Use '/wwopen' if you want to open it. The interface menu button won't work.
Also bypasses the exit pop-up that appears when logging out so you don't need to click twice to leave. Using '/ewshow' will allow it to show up for that session in case you want to see it.
v12.01 added a check for available log-in rewards. The welcome window will show if you can claim a reward. Roll back to v12.00 if you don't like this change.
Note: The rewards section in the overview doesn't seem to work on log-in. Pretty sure that's not my fault. Just go claim in the Daily Rewards tab.