The voyeur may observe the subject from a distance, or use stealth to observe the subject with the use of peep-holes, two-way mirrors, hidden cameras, secret photography and other devices and strategies.

The world record distance for a two-way contact is over 10, 000 km from near Vladivostok to New Zealand.

In 1935 she became the first person to solo the 2, 408-mile distance across the Pacific between Honolulu and Oakland, California ; this was also the first flight where a civilian aircraft carried a two-way radio.

* 9 October 1876: Bell makes the first two-way long distance telephone call between Cambridge and Boston, Massachusetts, USA.

The system could establish direction and distance, thus location, of a fighter and use the same radio signal for two-way voice communications.

The MDSA two-way system competes against satellite internet access ; the shorter round trip distance of only a few hundred kilometers reduces the latency compared with a geostationary satellite's 44, 000 mile 250ms latency.

* 2002: A street-driven Dodge Dakota pickup with a diesel engine built at Gale banks engineering hauls its own service trailer to the Bonneville Salt Flats and set an FIA land speed record as the world's fastest pickup truck with a one-way run of and a two-way average of.

The first two-way amateur radioteletype QSO of record took place in May 1946 between Dave Winters, W2AUF, Brooklyn, NY and W2BFD, John Evans Williams, Woodside Long Island, NY.

The adapter performs two-way communication, performing requests from the hub against the application, and notifying the hub when an event of interest occurs in the application ( a new record inserted, a transaction completed, etc .).

On February 7, 2011, Emery signed a one year, two-way contract with the Anaheim Ducks and led the Ducks into the playoffs, finishing tied for fourth in the league and posting a 7 – 2 – 0 record with 2. 28 goals-against average ( GAA ) and. 926 save percentage ( SV %) in 10 regular season NHL appearances.

* 1892 – Thomas Edison receives a patent for a two-way telegraph.

Charles Stross's books Singularity Sky and Iron Sunrise make use of " causal channels " which use entangled particles for instantaneous two-way communication.

Built on top of AppleTalk Session Protocol ( for legacy AFP over DDP ) or the Data Stream Interface ( for AFP over TCP ), it provides services for authenticating users ( extensible to different authentication methods including two-way random-number exchange ) and for performing operations specific to the Macintosh HFS filesystem.

Broadway was once a two-way street for its entire length.

) The inherent latency of the coding algorithm can be critical ; for example, when there is two-way transmission of data, such as with a telephone conversation, significant delays may seriously degrade the perceived quality.

In algorithms such as MP3, however, a large number of samples have to be analyzed in order to implement a psychoacoustic model in the frequency domain, and latency is on the order of 23 ms ( 46 ms for two-way communication ).

FM is widely used for broadcasting music and speech, two-way radio systems, magnetic tape-recording systems and some video-transmission systems.

MIDI messages are sent in only one direction, so a second cable is necessary for two-way communication.

The advent of the police car, two-way radio, and telephone in the early 20th century transformed policing into a reactive strategy that focused on responding to calls for service.

A sabotage radio was a small two-way radio designed for use by resistance movements in World War II, and after the war often used by expeditions and similar parties.

Total two-way trade in January 1998 exceeded that for all of 1978 ; in the first quarter of 2009, trade exceeded the full-year 1998 level.

On August 9, 1892, Edison received a patent for a two-way telegraph.

* August 9 – Thomas Edison receives a patent for a two-way telegraph.

Notable sites encompassed by the CCNS include Marconi Station, site of the first two-way transatlantic radio transmission, and the Highlands Center for the Arts, formerly the North Truro Air Force Station.

Duplex systems are employed in nearly all communications networks, either to allow for a communication " two-way street " between two connected parties or to provide a " reverse path " for the monitoring and remote adjustment of equipment in the field.

Note 1: The traffic may consist of two-way communications ; the expression " one way " refers only to the origin of the demand for a connection.

Two-way controller devices allow for a more robust network but cost two to four times more and require two-way X10 devices.

All International networks are required to implement support for permanent virtual circuits, two-way logical channels and one-way logical channels outgoing ; one-way logical channels incoming is an additional optional facility.

" Cable modems that used the RF cable network for the return path were considered ' two-way cable ,' and were better able to compete with the bi-directional digital subscriber line ( DSL ) service.

The Triton II ( Official name 82430HX ) was a version of Intel's Triton processor chipset with all the features of the 82430FX ( Triton I ) plus support for ECC, parity RAM, two-way SMP, USB, and then current PCI to improve speed.

While the POWER6 features a dual-core processor, each capable of two-way simultaneous multithreading ( SMT ), the IBM POWER7 processor has eight cores, and four threads per core, for a total capacity of 32 simultaneous threads.

Collaboration, teamwork, and two-way communication should be encouraged across hierarchical boundaries, especially with respect to process improvement.

However, cable often lacks " interactive " features ( e. g. text services, and extra video-screens ), especially on BSkyB owned channels, and the satellite platform lacks services requiring high degrees of two-way communication, such as true video on demand.

These two are sometimes combined to form a two-way communication device known as a transceiver.

Since the mid-1990s the Internet has had a drastic impact on culture and commerce, including the rise of near-instant communication by electronic mail, instant messaging, Voice over Internet Protocol ( VoIP ) " phone calls ", two-way interactive video calls, and the World Wide Web with its discussion forums, blogs, social networking, and online shopping sites.

In 1974 the first realtime two-way LPC packet speech communication was accomplished over the ARPANET at 3500 bit / s between Culler-Harrison and Lincoln Laboratories.

On the Internet, pseudonymous remailers utilise cryptography that achieves persistent pseudonymity, so that two-way communication can be achieved, and reputations can be established, without linking physical identities to their respective pseudonyms.

Additionally, amateur radio on these frequencies can provide hobby, educational and emergency two-way communication.

* Transceivers – Since communication over a single wavelength is one-way ( simplex communication ), and most practical communication systems require two-way ( duplex communication ) communication, two wavelengths will be required ( which might or might not be on the same fiber, but typically they will be each on a separate fiber in a so-called fiber pair ).

With the help of these holograms and Deanna Troi-with whom he had developed a close friendship-he devises a method to use a micro wormhole to establish two-way communication with Voyager.

An increasing number of vehicles are equipped with in-vehicle GPS ( satellite navigation ) systems that have two-way communication with a traffic data provider.

Cueing consists of the caregiver making a particular sound or other cue when the baby is in an appropriate place to urinate or defecate, in order to develop two-way communication.

#* Marine VHF radio uses some 88 channels in the VHF band for two-way FM voice communication.

AN / PRC 77 Radio Set is a manpack, portable VHF FM combat-net radio transceiver manufactured by " Associated Industries " and used to provide short-range, two-way radiotelephone voice communication.

The two reasons for this are that on the Internet, the cost of marketer-to-consumer communication is low, and the Internet enabled rapid feedback mechanisms due to instantaneous two-way communication.

# One-way communication is faster than two-way communication.