SPLAT fields

Let us say you are displaying all invoices for a vendor. You need to track which lines the user is currently viewing, so on a page up/down, the next/previous set of invoices can be dsiplayed. Many screens have a visible Position_To fields for this. Some don't. They use hidden aka splat fields.

How do you track the last invoice that was viewed ? You can save the unique key (company + vendor + invoice + suffix + cancel_seq) in the WS file. That, as you mentioned, will be clobbered by the next user that comes along. Instead define these in the .scr file. This will create a (company + vendor + invoice + suffix + cancel_seq) for each user so you know where to position the lookup.

There is brief mention in the Doc for Developers: Application Development Workbench Standards

Hidden and Detail Tab Form Fields
Position 8 can be used for two purposes: hidden fields and detail tab form fields.
An asterisk (*) in position 8 indicates that the field is a hidden field (also known as a
splat field). Hidden fields are part of the form but are not defined in the $SCREEN
section. A hidden field could be used to display a translation of a field value rather than
the actual value. For more information, see type X under “Field Type.”
Another use of a hidden field is to define the window fields associated with a command
button field.

Thank you for the info.  This was helpful