: Always run clients in Windowed Mode to make switching between accounts instantaneous.

or similar. This allows a second instance to open without "seeing" the first one. Hex Editing

Below is a concise, practical guide for running multiple Shaiya game clients on a single PC (commonly used to multi-box). This guide assumes Windows and a reasonable familiarity with installing software and editing files. Follow at your own risk — some game servers forbid multi-clienting and it may violate terms of service.