| Subject | English | Welsh |
| comp., MS | access code | cod mynediad (A string of characters entered by a user to verify his or her identity to a network or to a local computer, device, or client, or to sign in to an account, app, and so on) |
| comp., MS | international access code | cod mynediad rhyngwladol (The prefix that is used to direct a call internationally. The International Access Code is 011 in the United States and 00 in much of the rest of the world) |
| comp., MS | outside line access code | cod mynediad llinell allanol (The prefix that is used to access an outside line. In the United States, this prefix is typically 9) |