changing properties on a form for another form

declare a global variable depending on how many different types of users you have

the easiest way would be to declare a string and have a table to cross reference usernames passwords and security priveleges

on open of every form do a select statement
eg.
Module 1
dim global UserType as string
function Startup()
docmd.openform "frmLogin", vbModal
end function

in your autoexec macro just runcode startup

then in your login form after they enter their username and password first check to make sure it's the right password then check their usertype and make
UserType = whatever is in the table for that user

on open of every form

select case UserType
case "Admin"
everything.visible = true or
everything.enabled = true

case "Bookeeper"
bookeeping.visible or enabled = true
everythingelse.visible or enabled = false

and so on for every type of user you have
end select

Hope this helps.