File sharing on your network has nothing to do with the Switch (Barricade).
It is a function of the Network capabilities of Windows.
In Windows 98;
Make sure that you log on as Client for Microsoft Network.
There are three places to be checked for sharing:
The first two are in Control Panel, Network.
1. TCP/IP (or any other protocol that you are using for sharing) In the properties of the protocol it has to be bound to Client for Microsoft Network, and Sharing is Checked.
2. The general File and Print Sharing have to check.
The third: In My Computer, individual Drive or/and printer has to be checked for sharing.
CD-ROM can be shared (from Network point of view it is just another drive.)
Double click on My Computer, right click on the Drive Letter of the CD-ROM, choose properties, Sharing, and check the Sharing.
You can find some info as well as pictures here:
http://www.helmig.com/j_helmig/guidcnfn.htm
If you are refering to playing Games over the Internet?
Certain ports have to be opened on the Barricade.
http://www.practicallynetworked.com/support/gaming_help.htm