Whenever you create a new screen message, Enterprise Service Tools
automatically creates a default screen description inside the new screen message.
Important: A default screen description is created no matter
which method you use to create the new screen message (see
Creating a screen message).
By default, a default screen description is created with
the following three descriptors:- A Fields Checksum descriptor, which contains a checksum-like value calculated
from the number, size, and location of the fields in the application screen.
- A Number of Fields descriptor, which states the number of fields of all
types in the application screen.
- A Number of Input Fields descriptor, which states the number of input
fields in the application screen.
However, in the Screen Recognition Settings page
of Enterprise Service Tools section of the Preferences window, you can specify
the descriptors that you want to be included in the default screen description
(see Setting the contents of the default screen description).
The purpose of a default screen description is to provide a simple initial
screen description that the host editor can use to recognize an application
screen.
When you work with descriptors, remember that the
Generate
Runtime Code wizard can process certain descriptors differently,
depending on the following circumstances:
- The target runtime specified in the generation properties file.
- The flow type of the flow that contains the screen message.
- Whether the screen message contains BMS information.
See Support for screen descriptors in the runtime environments and When the flow type is Link3270 Bridge -- BMS map information.