DB2
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Q: What is zparm?

Answer:
ZPARM (DSNZPARMs) are DB2 installation parameters. Control system behavior, limits, defaults. DSNZPARM module loaded at startup. Changes need restart usually. Critical for performance and security tuning.
zparm parameter configuration
COBOL
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Q: Explain ENTRY statement

Answer:
ENTRY creates alternate entry point in subprogram. ENTRY 'ALTNAME' USING params. Called program appears under different name. Useful for multiple functions in one load module. Each ENTRY has own parameters. Not standard-use carefully.
entry subprogram alternate
JCL
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Q: What causes S806 abend?

Answer:
S806 is module not found. Check: program name spelling, STEPLIB/JOBLIB correct, library exists and contains module, module link-edited properly, aliases defined. S806-04 means not in JOBLIB/STEPLIB/LINKLIST.
s806 module not-found