You can use the same password for both your PC and Unix accounts (following the proper password-making rules, of course) but remember, if you change the password on one account, you don't change the password on the other. 

Changing your PC password
To change your PC password press the Ctrl, Alt and Delete keys at the same time. This brings up the Windows Security dialog box. In the lower left corner id the change password button. Left-click on the button and follow the instructions.

Changing your Unix password
Log onto your Unix/Linux account using SSH to go to earth.geo.hunter.cuny.edu. At the Unix prompt, type the following command:

                                yppasswd

and follow the instructions. See below for an example of the questions asked. When you enter your old and new passwords, nothing will echo on the screen (your password is a secret and we don't want any bad people looking over your shoulder sniffing passwords).

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earth.geo.hunter.cuny.edu{zaphod}191: yppasswd
Changing password for user zaphod.
Changing password for zaphod
(current) UNIX password:
New password:
Retype new password:

The password has been changed on everest.
passwd: all authentication tokens updated successfully.
earth.geo.hunter.cuny.edu{zaphod}192:

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Click here for rules to follow in creating a password.