Windows based PCs
From DOS 2.0 to Vista
Visual Basic from VB4 to VB.NET 2008
ASP.NET and PHP
Microsoft Office including Excel, PowerPoint, Access, Project, Word, etc.
MicroFocus Workbench with MF-COBOL
dBase III and dBase IV,
IBM AS/400 and /36
COBOL 74, 85, RPG IV and CL with DB/400
IBM 4381 and 4390
COBOL and PL/1 on DOS/VSE, CICS, JCL, DB2 and VSAM.
Fortran III and Fortran IV on RT/11
COBOL with UNIX on Apollo workstations
General network knowledge on having built more than one network, for home (wired and wireless with DSL and multiple clients) as well as for businesses with multiple servers, clients, dedicated lines, domains, 2000-Server, Internet access, etc.
General PC hardware knowledge.
Built my own "Lounge PC", a PC with an appearance that matches the lounge
rather than the office (aka "The Silverbox").