You can have a drop down combo box of users (first column ID field) then when they select it use a dlookup() function to look up the table and get the password from the password field of that matching ID row
then if the password doesn't match that - do something else.
Note dlookup is a little slow sometimes.
You can even have another 3rd column in the combo box but hidden with 0 width which is the password field and then see if the text box where they type the password in matches the column 3
Code:
if me.txtPassword = me.comboName.column(2) then
msgbox "yay correct password, now do stuff"
else
msgbox "incorrect password, now do stuff"
end if
column index starts from 0 so you need go, 0 - 2