Configure Sql Server 2005 For Remote Hookup?

Ok. Here is what I need to do: several computers on the intranet need to use a client program to access data from the server (a desktop)

Here is what is going on:

1. I am using Visual Studio 2005 c#.net 2.0
2. Sql Server Express 2005
3. I don't have IIS set up
4. The database is being shared from the c drive on the server (not sophisticated at all, but this is a one man operation!)

Questions:

1. Is IIS an absolute must to make this happen?
2. If not, a user pointed out that I can't use UNF to access the database. How do I set up the connection string to access the db on the server?

This is my basic connection string (local)

connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=C:MonzaDBMonzaDB.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True;Asynchronous Processing=true"

Thanks for any help on this subject. I know basically nothing about NETWORK programming and database administration!