Who played Jack McFarland in 'Will & Grace'?

In which TV series is Pacey Witter a main character? Who played Will Truman in 'Will & Grace'? Who played Grace Adler in 'Will & Grace'? Who played Karen Walker in 'Will & Grace'? Who played Samantha Jones in 'Sex and the City'? In which TV series is Samantha Jones a main character? Who played Miranda Hobbes in 'Sex and the City'? In which TV series is Miranda Hobbes a main character?