Need Help With WSAG

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Here is the blend file I am using, I changed a few things around. How do you fix the mouselook? It keeps moving around the screen even though I stop moving the mouse. Also how do you make it so you can connect more than 1 client? whenever i try, it just freezes? And how do you add an overlay scene for like the reticle, ammo, and maybe a gun or something? Any help would be greatly appreciated

Can Anyone Help?