AARP Eye Center
Using Google you would find the following.
https://support.microsoft.com/en-us/help/17145/windows-homegroup-from-start-to-finish
https://www.lifewire.com/definition-of-workgroup-816285
@RobertH489899 This was noted in the first link I provided in Message 2. More can be found in that link that carries you to this, https://support.microsoft.com/en-us/help/4091368 .
I answered the OP's question back on 10-28-2018 as he or she stated in Message 3. I am just saying that the 1st link I provided has this information if looked at and read by those interested in this topic.
"I downloaded AARP Perks to assist in staying connected and never missing out on a discount!" -LeeshaD341679