How can I restrict that the some ID can only login once in the some time

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I use Login control's Authenticate event to authenticate use.
I find that different users can use the same ID to login in the same time.
How can I restrict that the some ID can only login once in the some time

[Charlie]

Try to keep track of logins in database. On login enter a new record for
person, then on logout, remove record. When a new user logs in, first query
database to see if someone else is currently logged-in using his
credentials.

Charlie
"ad" <[e-mail]> wrote in message
news:OD**************@TK2MSFTNGP12.phx.gbl...

I use Login control's Authenticate event to authenticate use.
I find that different users can use the same ID to login in the same time.
How can I restrict that the some ID can only login once in the some time

[ad]

Thanks,
But how can I know a user logout?

Maybe the user press the logout button, or session time out or he close ID
without press the logout button.

"Charlie@NISH" <cf*******@nish.org> ¼¶¼g©ó¶l¥ó·s»D:eH**************@tk2msftngp13.phx.g bl...

Try to keep track of logins in database. On login enter a new record for
person, then on logout, remove record. When a new user logs in, first
query database to see if someone else is currently logged-in using his
credentials.

Charlie
"ad" <[e-mail]> wrote in message
news:OD**************@TK2MSFTNGP12.phx.gbl...

I use Login control's Authenticate event to authenticate use.
I find that different users can use the same ID to login in the same
time.
How can I restrict that the some ID can only login once in the some time