MAC ID is like a serial nr of your network card. On a windows system you can know what you're mac id is through START > RUN > type "cmd" without the quotes > type "ipconfig /all" without the quotes. In the list you'll see the MAC ID is listed (sometimes it's called Physical Address instead of MAC ID). For each network card in your computer (usually only 1) there exists a MAC ID.
To spoof a mac ID, you will need to know the mac ID you want to spoof. After that, how you implement it depends on your operating system or hardware. http://www.tech-faq.com/change-mac-address.shtml provides in depth details on how to change your mac address for a variety of operating systems.
This is a unique machine ID, also known as 'Mac Address' in terms of networking.
an oversized pot of mac and cheese
It's a response to a broadcast asking for the devices MAC ID. Routers and switches keep a table known as an ARP table which lists all the MAC ID's in the local area network. It will send ARP requests out to all the nodes in it's broadcast domain saying send me your MAC ID's. All the nodes in the network reply back with an ARP reply saying here is my MAC ID.
MACIDMedia Access Control IDentifier
yes! you can!
it should be on back of router!
The Block ID
No, MAC addresss and IP address are not the same. MAC addresses are "hard-coded" into the Network Interface Card (NIC) and only ID that individual card. The IP address is software generated and ID's both the network and the individual host.
The Block ID assigned by IEEE
This is not needed