> FireBird 1.5 Super Server version, Delphi 7.
> I try to use Delphi "Interbase" components TIBDatabase.Usernames
> but only can get user name.
>
> Because we need to know total users connected to server
> and from which pc and ip address.

You will need to insert this information into a table from your
program when someone 'logs in'. There are reasonably simple windows
calls for this information, and lots of sample Delphi functions.

> Is it possible to e.g dll to write the function to get
> local pc name and ip address and use user define function
> to call this dll.

Well you could write a UDF to get the PC Name and IP Address, but this
will be executed on the database server and so will contain
information about the DATABASE SERVER. You don't want information
about the server, you want information about the clients.

> When everytime got user login a trigger
> to write this information to a table or variable.

There is no trigger on a connection, but there is also nothing
stopping you from passing in this information from the login screen.

Adam