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Although the latest version of Microsoft Word can still open them, they are no longer developed. Legacy filename extensions include:.doc – Legacy Word document; Microsoft Office refers to them as "Microsoft Word 97–2003 Document".dot – Legacy Word templates; officially designated "Microsoft Word 97–2003 Template"
PDF 2.0 defines 256-bit AES encryption as the standard for PDF 2.0 files. The PDF Reference also defines ways that third parties can define their own encryption systems for PDF. PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2.
In residential telephony, an extension telephone is an additional telephone wired to the same telephone line as another. In middle 20th century telephone jargon, the first telephone on a line was a "Main Station" and subsequent ones "Extensions" or even called as intercom.
Seven-digit dialing is a telephone dialing procedure customary in some territories of the North American Numbering Plan (NANP) for dialing telephone numbers in the same numbering plan area (NPA).
An old rotary dial telephone AT&T push button telephone made by Western Electric, model 2500 DMG black, 1980. A telephone, colloquially referred to as a phone, is a telecommunications device that enables two or more users to conduct a conversation when they are too far apart to be easily heard directly.
A filename extension, file name extension or file extension is a suffix to the name of a computer file (for example, .txt, .mp3, .exe).The extension indicates a characteristic of the file contents or its intended use.
Starting January 1, 2012, fixed lines will be allowed to dial directly to other provinces/countries, but still using open dialing plan.To dial to other province, dial area code+phone number (0xx-xxxxxx), and to dial to other countries, dial 00+country code+phone number.
Each layer is interconnected by a web of wires that goes from each subswitch, to a set of the next layer of subswitches. In some designs, a physical (space) switching layer alternates with a time switching layer. The layers are symmetric, because in a telephone system callers can also be called. Other designs use time-switching only, throughout ...