C: 
C++ 
Cable 
Cache 
CAD 
Caddy 
Calculator 
Calendar 
Calibrate 
Callback 
Cancel 
Caption 
Capture 
Card 
Carrier (signal) 
Cascading windows 
Case-sensitive 
Cast 
CCD 
CD 
CD-audio or CD-DA 
CD caddy 
CD-i 
CD-ROM 
CD-ROM XA 
Cell 
Centre text 
Channel 
Character 
Character Map 
Checkbox 
Child 
Chip 
Click 
Client server 
Clip art 
Clipboard 
Clipping 
Clock 
Clock doubler 
Close 
Cluster 
CLUT 
CMYK 
Coaxial cable (coax) 
Codepages 
Collate 
Colour 
Colour printer 
Colour depth 
Colour palette 
COM1 
Command line 
Command prompt 
Communications (comms) software 
Compatible 
Compiler 
Compliant 
Compound document 
Compression 
CompuServe 
Computer names 
Concurrent 
CONFIG.SYS 
Configure 
Consumables 
Context-sensitive help 
Control key (Ctrl) 
Control Panel 
Conventional memory 
Copy 
Courier 
CPU or processor 
Crash 
Crop 
Crosshair 
Cursor 
Cut and paste