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Border

Visual Boundary

Enhanced Definition

In the context of traditional mainframe 3270 terminal interfaces, a "border" refers to the character-based visual separation or framing used to delineate sections, fields, or logical areas on a screen. It is not a native graphical element but rather an effect achieved through the strategic placement of specific characters (e.g., hyphens, vertical bars) within screen definitions.

Key Characteristics

- Character-based Implementation: Borders are constructed using standard alphanumeric or special characters (e.g., |, -, +, _) directly embedded as literal text within screen definitions.
- Application-Defined: The appearance and placement of borders are entirely determined by the application developer during screen design (e.g., ISPF panel definitions, CICS Basic Mapping Support (BMS) maps).
- Fixed-Position: Due to the fixed-row and fixed-column nature of