- First, go to Runescape.com with two browser or two tags.
- Next, click the “PLAY RUNESCAPE (EXISTING USER)” button with both browser or tags.
- Select “Signed Applet Using Default Java (Recommended)” for the first one.
- Select “Unsigned Applet Using Default Java” for the second one.
- For both browsers or tags, select the same world.
- Finally, you can log in to two accounts in the same world at the same time.
Note: The one selecting “Unsigned Applet Using Default Java” is slower than the other one.