| target | Points to the object on which this invocation is being invoked. |
| args | Array of pointers to the argument list in the operation declaration. this includes the return, inout and out arguments. |
| arg_number | Number of arguments in the above array. This is the number of elements in the above array. |
| operation | The name of the operation being invoked. |
| ope_len | Number of charecters in the operation name. This is an optimization which helps us to avoid calling strlen () while creating a message format. |
| cpb | The collocation proxy broker for the target if one exists. |
| type | The operation type which could be a oneway or two way operation. this information is availbe in the IDL file. |
| mode | Invocation mode. This information is also available in the IDL file and in the generated code. |