首先在你的機器上設置允許遠程(還要設置你的firewall)
1.windows machine
在   "Control Panel\System and Security\System"中click remote setting
(google for details)
2. test from another computer by clicking "remote desktop
connection"   and login
then you see your computer interface(asif you sit in front of your computer)
3. on your ipad ,download a free "remote desktop
connection" software from appstore and test again.
  that is all.
4.fly to China ,use  "remote desktop
connection" software  on your ipad to connect to your computer in your office(USA) 
你可以上xys and  發帖子  看文學city  mitbbs 
etc
linux machine can do it similarly
1.install vncserver on linux,
2.install vncviewer on my laptop
3.start vncviewer on my laptop to  connect to linux machine.