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KVM Switch & two monitors

I 've got four PCs connected to a regular 4-way KVM switch, all connected to one ..... 26" monitor (using vga) + mouse + keyboard + speakers + mic.
In addition one of the PCs has a touchscreen monitor connected (VGA + Serial). I would like to share the touchscreen monitor with a second PC.

I think the following equipment will work but I'd like opinions from fellow experts as to whether it will work and what the risk is of damaging my video cards.

I have an old two way KVM switch which switches VGA and what were serial mice (not PS2).  If I used this to switch the touchscreen monitor VGA and the serial controller, will I reget it. I will effectively be pulling vga & serial cables out of one PC and plugging the into another PC while they are on, which everyone says is a no-no.
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I know switching off both PCs between switching would be risk free, but it would be too inconvenient and is not an option
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andoss
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ASKER

Thanks for that link ndary. I suspect that they are quite expensive. I'll try my old kvm and hope that the serial end of it works.
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