Questions on Offset Tracking Tutorial

Microwave Toolbox
#1
  1. In step 4 (Apply Orbit File operator) it is carried out only for one master image?
  2. And then the received file with (… _ orb) does not join in step 5 (DEM Assisted Coregistration)? In step 5 primary files are used?
  3. In Step 6 (Create subset image) allocation of subset is carried out on stack product on master image?