How to logonserver to database, when Connection is Window Authentication Mode?

Please help friends!!!
How to logon to database, when Connection is Window Authentication Mode?
If it is SQL Server Authentication Mode than the connection is like this:
report.Database.LogOnServer "p2ssql.dll", "local(local)", "abc","sa",""
but in Window Authentication Mode there is nothing to do with userid & password, we just check on "TRUSTED CONNECTION"
so what will be the ......... "report.Database.LogOnServer??"