Informix 4GL case study
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Source-derived document; reported behaviour, inference and evidence gaps are identified in the text.

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Help and keyboard behavior

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Interface: Help and keyboard behavior

The help file contains entries for Customer, Orders, Stock, Reports, and Exit, as well as customer maintenance, order entry, stock maintenance, and reporting. It also documents data-entry abort using DEL or CTRL-C, state selection, and a reverse-video green display for item totals above $500. These are help-content findings and should not be treated as confirmed runtime behavior without corresponding Java event and display logic. E0004

Entry 2006 shows an Informix-4GL ON KEY (F1, CONTROL-F) handler. The supplied form classes do not show corresponding F1 event-handler logic. The evidence therefore supports documented intended help-key behavior, not confirmed Java implementation. E0004

Harten documentation of the Informix 4GL and Java source repository, from the retained 17 October 2026 export. The exact upstream revision analysed is not established. Source findings do not establish runtime behaviour or equivalence between the implementations.

Evidence identifiers are retained for traceability. The underlying analysis records are not included in this public edition; credential values are redacted. About this case study.