| Subject | English | Welsh |
| comp., MS | communications port | porth cyfathrebu (A serial communications port used to connect a device, such as a modem, printer, or mobile device, to a computer) |
| comp., MS | Data Communications Equipment | Offer Cyfathrebu Data (One of two types of hardware that are connected by an RS-232-C serial connection, the other being a Data Terminal Equipment (DTE) device) |
| comp., MS | Private Communication Technology | Technoleg Cyfathrebu Preifat (A proposed protocol standard that supports authentication and encryption to secure privacy in Internet communications. PCT is similar to the Secure Sockets Layer (SSL) protocol) |
| comp., MS | Windows Communications Apps | Rhaglenni Cyfathrebu Windows (The download package that includes People, Messaging, Mail, and Calendar) |
