十分困難的問題,有關圖書館的電腦,懂的有20x2=40分......

1. This is because when they setup account, they only set up adminstrator account.so, when the computer is not in use, they are in screen saver stage.When you wish to use computer, touch any key to call the password message box.You need to tell the computer you have the right to enter, so insert the password to tell the computer and then after validation.If your password is accepted, it will enter their personnal setting.
2.This is the password of adminstrator, it can be any number or characters' combination. The password was set when the first time to set up adminstrator account. For example-The other user of a computer, when you create a new account, you can set the password and the user name also. It is same as adminstrator but the different is the adminstrator can control all users and set the limited power for the user, but the normal user is not.
I hope you can understand.

Q1 "Administra tor"帳戶是一個管理的戶口, 只有由圖書館的職員才可登入, 改變電腦的設定. 一般讀者, 應該按 "Public"的button, 便可上網, 不須要密碼.
Q2. 以安全為理由, 圖書館設定的密碼是不會讓讀者知道

q1) ctrl+alt+del
q2) 即係管理人ge密碼, 佢自己set, 一堆字母同數字, 冇其他人會知