The Exists tool can be used to determine if the specific data needed by a process can be located.
The input to the Exists tool is the location of the data (track lines, or specific surface, for example). The output ports represent the conditions “Does Exist” or “Does Not Exist”. Each of these ports can be connected to ports on other tools.
In the process model image below, conditions specified in the Exists tool are connected to the Conditions ports in the Add to Surface and Create HIPS Grid using CUBE tools.
In this example, the Exists tool verifies if the surface exists, and if it does, it adds the new data to the existing surface. If the surface does not exist, it will create a new surface.