Methodsshould be used whenever some input is expected and the Serverdelivers a result. One should avoid using Variablesto write the input values and other Variablesto get the output results as it was necessary to do in OPC COM since there was no concept of a Methodavailable. However, a simple OPC COM wrapper might not be able to do this.

Methodscan also be used to trigger some execution in the Serverthat does not require input and / or output parameters.

Global Methods, that is, Methodsthat cannot directly be assigned to a special Object, should be assigned to the Server Objectdefined in OPC 10000-5.