Programming languages:
As main: C, C++, Pascal, Delphi, Assembler for any platforms, PL/1, XML, HTML, Fortan, Visual Basic, Visual Basic for Application, Algol 60
As additional: Smaltalk, Ada, Algol 68, Prolog, Lisp, Oberon, Forth, REXX
Operation systems, APIs and libraries:
Windows 3.x/95/NT/W2K/XP, Linux, SCO Unix, Sun Solaris, OS/370, VM/SP, MS-DOS, Win16, Win32, MFC, OWL, VCL, Posix
RDBMs and database connectivity APIs:
MS SQL Server, Sybase SQL Anywhere, MS Access, Oracle, dbVista, FoxPro, Adabas, ODBC, SQL
Network protocols:
TCP/IP, DDE, NetDDE, RPC, COM