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Push-to-talk (PTT), also known as press-to-transmit, is a method of having conversations or talking on half-duplex communication lines, including two-way radio, using a momentary button to switch from voice reception mode to transmit mode.
In North America, instead of a PTT there was the private monopoly Bell System (for the US)/Bell Canada (dominant ILEC in Ontario, Quebec and (historically) parts of what is now Nunavut; competes with other fixed-line carriers in the rest of Canada) responsible for telecommunications and a separate federally run US Postal Service/Canada Post for mail delivery.
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PNG icons have been supported in most distributions of Linux since at least 1999, in desktop environments such as GNOME. [88] In 2006, Microsoft Windows support for PNG icons was introduced in Windows Vista. [89] PNG icons are supported in AmigaOS 4, AROS, macOS, iOS and MorphOS as well. In addition, Android makes extensive use of PNGs.
The AN/PRC-163 Multi-channel Handheld Radio, is a dual-channel tactical handheld radio manufactured by L3Harris Technologies, Inc. for the U.S. military, referred to by the U.S. Army as the Leader Radio. [1]
W. File:Windows Address Book icon Windows xp.png; File:Windows Contacts Icon.png; File:Windows DVD Maker Vista Icon.png; File:Windows Easy Transfer Logo.png
PTT implements an article commendation (推文) and criticism (噓文) scheme as its article rating and commenting system, in place since 25 May 2002. PTT was the first Chinese-language BBS to implement such a system. Under this system, users can evaluate an article by giving it a tuei (推), adding a point, or a hsü (噓), subtracting a point ...
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