How to Use Two Computers With One Display Monitor

I appreciated your comment above on hooking up 2 pcs to one monitor.

Can you suggest what bang out of KVM switch to buy?

I dont know if the monitor will have an input selector on the display or not.

I want one keyboard and one mouse.

Both, at this point both are wireless although they can be wired also.

I had read somewhere that a KVM switch can dramatically slow down the refresh rate dramatically.