For completely isolated environments, players use virtual machine software like VMware or VirtualBox.
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The Ultimate Guide to Shaiya Multi-Client: Maximizing Your Gameplay Experience
Shaiya is an old game (Unreal Engine 2.5). It was designed to run on Windows XP with 512MB of RAM. But running two or three clients in 2024 requires specific optimizations to avoid stuttering.
Which (Official or a specific Private Server) are you targeting?
Always run all clients in windowed mode to allow quick alt-tabbing.
: Specialized launchers or modified .exe files are commonly used by the community to allow multiple instances. Some players also use third-party software like Process Explorer to kill specific "mutex" handles that prevent the game from opening twice.
Shaiya implements multiple layers of protection against running multiple instances: