>>It is a bit unsafe.
>>
>>I don't understand your other question, though. T-SQL is a query language used by SQL Server. You don't need to install anything, as long as you have SQL Server installed (with or without client tools), T-SQL is what you use to query the database.
>
>When I was working at a client site, a few years ago, they only allowed us an utility that we launched such as a CMD window. This was allowing us to query only. This is the one I am referring to. As far as I remember, there wasn't anything installed on my PC, at least not SQL Server. So, I am wondering what kind of utilty it was.

Maybe SQLCMD or one of the other command line utilities that have come with SQL Server over the years.

Lots of other options. Access, Excel, TORA, and others all will connecto to SQL and allow you to query.