A number of Windows 95 releases occurred between the original release and the OSR 2 release. The OSR 2 release was not a retail product; instead, it was available only for original equipment manufacturers (OEMs) to install on a new computer. Each release features a different flavor of the RAS API functionality. Because of this, we recommend that you install the latest RAS upgrade package—DUN 1.3—to raise RAS to the current functionality level of newer platforms. You can obtain the DUN 1.3 upgrade for Windows 95 at http://www.microsoft.com/support. This chapter assumes that you have installed at least the DUN 1.3 upgrade; we will not address RAS issues from earlier DUN versions.