1. I would set them to two cores per VM depending on what the VM is doing. I'm not sure on this but I think to be able to use more than one core, you need to make sure virtualization is turned on in the BIOS. I know this is true of VirtualBox on Linux, don't know about windows. If the VMs sit idle most of the time, give them the ability to use at least two cores.
2. Only one display.
3. I have no idea. When you find out, tell me.
4. I'm not sure about VMPlayer, but you can with VirtualBox. EDIT: It might be something like this:5. No idea once again. Try it and let me know. I would think so, but I'm basing that on how ESX works.Code:R:\vm\vmware\vmplayer.exe -x "n:\centos\Red Hat Enterprise Linux 4.vmx"