Schlage PIB300 User Manual page 1173

If you have two users with the same name: You must enter a unique name
for each user. If two users have the same name, you might add a middle
initial, or you might add a job description after each. For example, if
you have two users named John Jones, you might enter something like
Jones, John (engineer) and Jones, John (maintenance).
ID Number: If you change a user's ID, be sure to let the user know. The user will
not be able to gain access through any reader without knowing the correct
ID.
Each number must be unique (if you could give the same number to two
users, the reader would not know which was trying to gain access). Longer
numbers are slightly more secure, but four or five digits are generally
adequate in context where user's must enter the number. You may enter up to
ten digits if you do not use a duress code, or up to nine digits if you do use a
duress code. If you use a duress code, make sure that you do not create an
ID that begins with that digit; see page 47 for more about duress codes. If you
have set up an ID length on the Settings tab in the Reader Properties, make
sure that you do not create an ID that is longer than this; see page 47 for more
about ID length.
If you use Wiegand card readers: Enter the ID number stored on the card.
Do not begin an ID with zero (0) if you are going to enroll the user with
the command menus on the reader: HandNet lets you enroll a user by
either picking Enroll from the Reader menu, or by using the command
menus on the reader. If you are going to use the command menus on
the reader, the ID number should not begin with zero (0). While HandNet
distinguishes between 5 and 0005, the process of adding a user from
the reader does not. This means that if you create a user with an ID of
0005 in HandNet and try to enroll that user with the command menus on
the reader, when you type 0005, the reader thinks you are enrolling user
5; this will not correspond with 0005 in HandNet. If you are going to use
Enroll on the Reader menu, you can begin an ID with zero (if you are
never going to begin an ID with zero, this might be a good choice for a
duress code if you use one).
HandNet for Windows
91