It also verifies that the structure of the major parts of the image file is correct. If errors are found, the first error of the worst severity is returned.
GST information is present only in shareable image files.
If a patch is present, the actual patch code can be displayed. An ISD contains information that the image activator needs when it initializes the address space for an image. For example, an ISD tells whether the ISD is shareable, whether it is readable or writable, whether it is based or position independent, and how much memory should be allocated. You can use these values to identify changes in the system since the image was linked last.