There is no difference between your access database created on the desktop compared to one that is used on the web. All you need to do is to create an ASP connection script which access the database.
eg:
Dim strdbconone
Set strdbconone = Server.CreateObject("ADODB.Connection")
strdbconone = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & Server.MapPath("databasepath.mdb") & ";Jet OLEDB

atabase Password=password;"
The above will create a connection to the database (replace 'databasepath' with you database path & password with your password if applicable)
The next script will create the recordset:
Dim rsPersonIDCheck
Set rspersonIDCheck = Server.CreateObject("ADODB.Recordset")
Dim strSQL
strSQL = "SELECT username, password FROM Person ;"
rsPersonIDCheck.Open strSQL, strdbconone
From this you can read and display records, if you wish to add records to the table then you need to open the table with the appropriate lock and command (adLockOptimistic) eg:
Set rsPersonIDCheck = Server.CreateObject("ADODB.Recordset")
rsPersonIDCheck.Open "tblUsers", strdbconone, 2,2
This will allow you to write to the database.
Once finished do not forget to close the recordset and database connection.
Hope this helps you,
If you need more help then PM me and i should be able to send you an example script.
Rich