Facebook app, permissions and pages

i found this: http://wiki.auzigog.com/Facebook_Photo_Uploads and made it to work for me but now i have sev开发者_Python百科eral questions about it.

for this line: $user = $facebook->require_login(); is it possible to have that to work with Pages/business?

second: if the user added my app, and it is going to be only for our clients, can i change the $user = to his ID and then it will check if he agree to use my app and continue?