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<object runat="Server" scope="Application"
id="rstActiveUsers" progid="ADODB.Recordset">
</object>

<script language="VBScript" runat="Server">
' The first thing you should notice is the top line.
' It creates an application scoped recordset object
' named rstActiveUsers that I'll use to store all
' our user information.
'
' Note: I've wrapped it for readability

Sub Application_OnStart()
' Selected constants from adovbs.inc
Const adInteger = 3
Const adVarChar = 200
Const adDate = 7

' Here I set up in memory active user recordset
' by adding the fields I want to it and defining
' their data types.
rstActiveUsers.Fields.Append "id", adInteger
rstActiveUsers.Fields.Append "ip", adVarChar, 15
rstActiveUsers.Fields.Append "browser", adVarChar, 255
rstActiveUsers.Fields.Append "started", adDate

' Next I open our recordset so that we can use it.
' That basically gets everything ready for our
' first user.
rstActiveUsers.Open
End Sub

Sub Session_OnStart()
' Set session timeout to 20 minutes
Session.Timeout = 20

' Set a session start time. This is pretty pointless,
' but it does ensure that we start a session and
' assign the user a session id and it can help
' troubleshooting if we ever need it.
Session("Start") = Now()

' Move to the end so records are added in order.
' Again not of any real importance, but it keeps our
' user table nice and orderly.
If Not rstActiveUsers.EOF Then rstActiveUsers.MoveLast

' Add a record and insert users data. I'm just
' storing some basic info, but naturally you're free
' to store whatever you want.
rstActiveUsers.AddNew

rstActiveUsers.Fields("id").Value = _
Session.SessionID

rstActiveUsers.Fields("ip").Value = _
Request.ServerVariables("REMOTE_HOST")

rstActiveUsers.Fields("browser").Value = _
Request.ServerVariables("HTTP_USER_AGENT")

rstActiveUsers.Fields("started").Value = _
Now()

rstActiveUsers.Update

' Now that we've got the information, all that's
' left is to display it. See test_page.asp for a
' demo. It includes the pages show_count.asp and
' show_users.asp which can also be used
' individually if desired.
End Sub

Sub Session_OnEnd()
' Selected constants from adovbs.inc
Const adSearchForward = 1
Const adBookmarkFirst = 1
Const adAffectCurrent = 1

' Find the appropriate record. Using session id is the
' easiest way since I use this as the primary key.
' This line positions us on the appropriate record.
rstActiveUsers.Find "id = " & Session.SessionID, _
0, adSearchForward, adBookmarkFirst

' Now that we're on the record, delete it.
' I use the EOF to make sure we've got one.
If Not rstActiveUsers.EOF Then
rstActiveUsers.Delete adAffectCurrent
End If
End Sub