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

Tia
Gerard