Thanks, this is helpful answer but it does not answer in any way my main (first) question
(as well as the topic in the title).
Let me note that I usually write one question per post. The first one is the main, the following ones are just illustrative, explaining or collateral to the main (first) question.
What are the minimum hardware and software requirements needed for an element of network to be security identifiable (to have SID)? to join AD?
(*) sysadmin138 wrote: "it [SID] is created
during install process"
Does it (*) mean that computers running Windows but without hard disks cannot be identified or joined to AD?
2a) that installing by copying pre-installed Windows XP image makes machine unidentifiable (having the same SID)?
I frequently see that sysadmins install computers by copying images of pre-installed Windows XP from one hard disk to all new computers from the box. Does it, in comparison with (*), mean that they all (multiple computers) have the same computer SID? or that such time-saving shortcut cannot be used in network?
I myself do it in home network PCs, this one from which I am currently writing.
One can read that in MS docs Computers in Active Directory Domain that:
(**) "The server uses the MAC address or
the client machine GUID to find the
computer object in Active Directory
domain for each client"
Does it(**) mean that computer can be identifiable by MAC and make part of AD without having any SID, from question 2)?