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Languages
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Assembler (Batch+CICS)
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Cobol (Batch+CICS)
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CICS (macro+command)
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RPG
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Various 4GLs
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Various report writers
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Databases
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DB2
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SQL
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ODBC
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IMS
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DL1
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IDMS
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VSAM
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and other legacy technologies...
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Operating systems
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OS/390 technologies
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MVS/ESA, VM/CMS, VSE/ESA
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Internals expertise
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Systems programming
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Performance tuning
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Security & communications, RACF/ACF2
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CICS (system & applications)
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LIOCS (operating systems)
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PIOCS (hardware interfacing)
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and other low level system functions....
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Communications
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SNA
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VTAM
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BTAM
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LU6.2
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APPC
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CPIC
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3270 native
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and others...
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Utilities
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Most common program editors
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Most disk utilities
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Most library management systems
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