For a character mode host--can the cursor locate in this field? In many situations, cursor location may be needed as part of properly synchronized recognition of a screen. When the ScreenDef properties CursorHomeColumn or CursorHomeRow are set, a screen must have the cursor matching these locations on first visit to a screen. If data is entered in the screen or a popup appears above it and is then closed, the cursor might not be in the home location.
Any field with a write or readwrite action property will then be used--if the cursor is in an entry field, the screen recognition will trigger as "ready".
However, sometimes it is perfectly valid to position the cursor in fields that are readonly--if that is the case, set this to true for a field, to enable recognition to flow smoothly during data entry, cursor movement or the closing of a popup over the screen.
