A "single user" refers to a single computer or system using the operating system. Meaning only one computer will/can have it installed.
The lines on a table tennis table have no purpose when playing singles.
Drug and Disease Free.
Height (and) Weight Proportionate
Women looking for women Women4women
They've had 7 number 1 singles (7 singles to top the charts) in the UK alone if that's what you mean.
On singles it means backed with as in "side A backed with side B."
Albums selling one million units and singles selling two million units.
Boston singles means exactly what it sounds like. They are matching single people that live in or around the Boston area. Many major large cities have this similar service.
Not sure what you mean; Singles is always played 1v1, doubles is played 2v2
This most likely means he is looking for someone to date.
The most famous singles of Chris Knight include 'It Ain't Easy Being Me', 'Becky's Bible', 'The Jealous Kind', 'Cry Lonely' and 'In The Mean Time'. He also wrote songs for other artists.
Assuming you mean children, the answer is no. Only married couples (homosexuals are not allowed to marry) or singles can adopt children.