ATSC represents the original analog or non-simulcast channel frequency while the minor is a sequentially assigned number for the selected channel with zero reserved for the analog channel. The channel may also be marked as hidden from the viewer. The DVB extensions use privately defined descriptors within the Bouquet Association Table for DVB-S or the Network Information Table for DVB-T. The NorDig version allows for marking a channel as hidden, while the NDS Group version simply omits the channel entry. The DVB system neither promotes nor mentions either system due to the simple fact that the already defined H.222 Program number and Transport Stream ID can achieve the same purpose and also hide a channel by simply omitting it from the Program Association table. All these methods share the same principle of not allowing any kind of viewer reordering as could be achieved under analog and generic digital systems. This locked-down ordering is one of the main criticisms of using either method. Digital television multiple channels Because DTV can carry any number of streams referred to as multiplexing, program numbers can be used to group them into more than one channel which can then be reassigned by virtual or logical channel numbers. United States and Canada An example of the ATSC major and minor numbers used for a station in the United States or Canada would be to typically have its main programming airing on say channel 8 (the "major channel") with analog on 8.0 and digital on 8.1 (the first two "minor channels") with other entertainment channels being below 8.99 on channels 8.2, 8.3, and up and any additional informational data channels ranging from 8.100 to 8.999. The channels can also be displayed using a hyphen (such as 8-1) or a space; however, on a common seven-segment display, a decimal point would not waste a whole character. The decimal point is more familiar to FM radio listeners who tune by frequency rather than channel, and avoids confusion with ranges of values (for example, 2-4 may be misinterpreted as the range 2 to 4 instead of the fourth sub-channel of channel 2). Most stations in the United States follow the ATSC numbering guidelines; however, there are some exceptions for low-power stations such as New York City's WNYZ-LD, which was temporarily broadcasting on VHF channel 6 in digital, but used the virtual channel 1.1, instead of 6. This operation lasted for