Disable the use of vSphere Client to vCenter 6

I have recently moved to ESXi 6 and updated the vCenter. I am getting use to the web client but there are others here that want to use the client as a remote KVM switch. I have looked all over to find a way to block the use of the vSphere Client and I can not find it or im asking the wrong question.

So my question: Is there a way to block the vSphere client from accessing the vCenter server?

Jim