A Prompt and an Echo type is defined for each logical input device. For example, enabling the pick device might prompt with a cursor of a particular shape which would track the tablet or mouse to constitute an echo. Acceptance of a trigger by the application, hitting a key, for example, causes feedback via an acknowledgment process. Thus, the picked object could be made to blink. Different prompt/echo types can be set when initializing the device. They are implementation and workstation-dependent, so see the relevant reference manual for details.