单项选择题 Which of the following is a graphical enhancement in Windows Vista?（）

单项选择题 A support technician wants to help a user, in a different city, navigate a new software program. Which of the following will allow the user and technician to view and control the Windows XP PC desktop simultaneously?（）

单项选择题 A user’s document will not print, and as a result sends the same print job several times to the printer. A technician notices that the print queue is still waiting for the first job to finish before printing successive jobs. Which of the following would BEST resolve this issue?（）