| Subject | English | Welsh |
| comp., MS | COM add-in | ychwanegyn COM (A supplemental program with the filename extension .dll or .exe that extends the capabilities of a program by adding custom commands and specialized features) |
| comp., MS | COM class | dosbarth COM (A concrete implementation of one or more COM interfaces. COM objects are instances of COM classes) |
| comp., MS | COM object | gwrthrych COM (An instance of a COM class) |
| comp., MS | COM port | porth COM (A serial communications port used to connect a device, such as a modem, printer, or mobile device, to a computer) |
| comp., MS | someone@example.com | rhywun@example.com (A sample email address used in Microsoft software and Help files for demonstration purposes) |