How Can I Get User Statistics?

I am supporting a SQL Server 6.5 databases that users query using
pre-configured reports. The reports use views, stored procedures,
and triggers set up by the programmers and accessed thru a client
on the workstation.

I need to be able to count which users log in (SQL Server security),
how often, and either which reports they use or what tables they
select.

I do not have access to the WindowsNT server, so the solution
has to work with SQL Server SA rights.

Thanks for any suggestions.

Joan