# A CDE Definition

X.28

An ITU standard (1977) for exchange of information between a DTE and a PAD; commonly known as PAD commands.

**Before/After Your Search Term**

Before | After |
---|---|

X Windows | X.29 |

x-y matrix | X.3 |

x-y monitor | X.32 |

x-y plotter | X.400 |

x-y-z matrix | X.400 API Association |

X++ | X.445 |

X+V | X.500 |

X.12 | X.509 |

X.21 | X.75 |

X.25 | X.PC |

**Terms By Topic**

Click any of the following categories for a list of fundamental terms.