>Hi.
>Just looking for ideas/best practise in processing multiple users
>Our app can have multiple users logging in (Maintained in a Sql Database)
>App using Sql Server, C# and can be run from Lan PC or Rdp session or Stand alone
>
>
>Ideally, don't want the same user logging in twice, but how do we determine if:
>A user is really in the system
> v/s
> A user might have logged in but there was a power cut and Application still thinks they are logged in but they have in fact been kicked out
>
>If there is a reliable way of telling that a User is in fact in the system, then at login point we can prevent access by the same user id

You've got this under 'Web' application so I assume this is ASP.NET ?
Are you using Forms Authentication ?