To use your Custom Code Library from your code, you simply call the methods with ClassName.MethodName(..). For example CustomCodeLibrary.GetCurrentPID(). You do not need to specify the namespace where the class is defined. Figure 1 below shows an example of an info node where CustomCodeLibrary.GetCurrentPID() is used in a text piping.
Figure 1 - An info node that calls the custom code method CustomCodeLibrary.GetCurrentPID()