I've used the following to restrict user access. Usually by locking controls on a form or making things invisible
Dim stUser As String
stUser = GetLoginName
Select Case stUser
Case "DAVID", "KATHY", "JO", "Micheal"
Public Function GetLoginName() As String
' Returns the network login name
Dim lngLen As Long, lngX As Long
Dim strUserName As String
strUserName = String$(254, 0)
lngLen = 255
lngX = apiGetUserName(strUserName, lngLen)
If (lngX > 0) Then
GetLoginName = Left$(strUserName, lngLen - 1)
GetLoginName = vbNullString
GetLoginName returns the current users windows log in. I also have a table with columns for username and boolean columns for privileges such as "Can_Sign_Quote", "Can_Sign_PO". So I can check that table to see if user x has privilege y.
This works for me because I only have a few users and "real security" isn't a requirement. It's mostly used to prevent people from seeing things they don't want or need to see.