Signifies an "input" argument to an invocation, meaning that the argument is being passed from the client to the server. ARG_IN.value is one of the possible values used to indicate the direction in which a parameter is being passed during an invocation performed using the Dynamic Invocation Interface (DII).

The code fragment below shows a typical usage:

ORB orb = ORB.init(args, null);
    org.omg.CORBA.NamedValue nv = orb.create_named_value(
         "IDLArgumentIdentifier", myAny, org.omg.CORBA.ARG_IN.value);