The INVISIBLE attribute prevents user-entered data from being echoed on the screen during an interactive statement.
INVISIBLE
The INVISIBLE attribute can be used for EDIT and BUTTONEDIT fields.
Characters that the user enters in a field with the INVISIBLE attribute are not displayed during data entry. Depending on the front end type, the typed characters are displayed using the blank, star, underscore or dot characters.
The INVISIBLE attribute has no effect when display data directly to a field with DISPLAY TO or DISPLAY BY NAME.