Indicates that the record is a regular virtual channel record. For non-MPEG-2 channels, the waveform_type shall be defined as “normal.”Indicates that the record identifies a virtual channel that may not be accessed by the user by direct entry of the channel number (hidden). Hidden channels are skipped when the user is channel surfing, and appear as if undefined if accessed by direct channel entry. Programs constructed for use by specific applications (such as NVOD theaters) utilize hidden virtual channels. If a channel_properties_descriptor() is present and the hide_guide bit is 0, the channel may be considered to be inactive. Inactive channels may appear in EPG displays.Hosts are expected to treat virtual channel records of unknown channel_type the same as non-existent (undefined) channels.