Okay.. You have something called as environment variables in your computer.. Classpath is one of the many environment variables. All you need to do is to edit the classpath environment variable in your computer by adding the path to the ojdbc14.jar or the OCI jar file. The new path can be appended to the existing value by using the semicolon (
as the delimiter. To find environment variables do the following.
Right click on My Computer -> Properties -> Advanced System Settings -> Advanced Tab -> Environment Variables button (in Windows 7 OS). In case if you have not set class path till now then kindly do set it.
Oracle client is nothing but a program which talks to the Oracle server and gets your intented work done. Its one of the client-server architecture model. Kindly refer online tutorials for more information.