ABAP Alive
SAP's internal application language — COBOL-flavored, enormously deployed, and invisible to anyone outside the enterprise world it quietly runs.
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SAP's ABAP (1983) — Advanced Business Application Programming — is the language the world's largest business software runs on: report-generation roots, now a full OO language on the NetWeaver platform.\n\nIt is invisible and enormous — the most-used proprietary business language in existence.