Some websites allow play in real time and immediately show the opponents ' moves, while others use email to notify the players after each move ( see the links at the end of this article ).

Some websites even cater to flamers and trolls, by allowing them a free environment, such as Flame-Wars forum.

Some websites and tools exist which provide a phonetic guide for Japanese web pages ( in hiragana, romaji or kiriji ); these are popular with both Japanese children and foreign Japanese learners.

Some websites allow geocachers to search ( build queries ) for multiple caches within a geographic area based on criteria such as Zip Code or coordinates, downloading the results as an email attachment on a schedule.

Some pawnshops sell specialty items online, on eBay or other websites.

Some of these websites have competitions, battles and signature of the week contests, where members submit their entries to have them featured on the website.

Some merchants attract customers to their websites by advertising through web banners or email.

Some websites derive revenue by selling advertising space on their site either through direct sales or through an advertising network.

Some websites derive revenue by offering products or services for sale.

Some websites report a " not found " error by returning a standard web page with a " 200 OK " response code ; this is known as a soft 404.

Some websites are dedicated to providing email services, including Hotmail, Gmail, AOL, and Yahoo ; but there are many internet service providers which provide webmail services as part of their internet service package.

Some websites have a referrer log which shows which pages link to that site.

Some scammers will advertise phony academic conferences in exotic or international locations, complete with fake websites, scheduled agendas and advertising experts in a particular field that will be presenting there.

Some consumers use price comparison websites to find the best price and / or to make a decision about who or where to buy from.

Some people believe that the use of social networking sites is a form of " participatory surveillance ", where users of these sites are essentially performing surveillance on themselves, putting detailed personal information on public websites where it can be viewed by corporations and governments.

Some websites state that a Smallville once existed in Cloud County, northwest of Concordia and south of Norway, of which nothing remains but an old railway station, but there seems to be no record of this on Kansas historical sites.

Some of those websites also have lists of active servers for users to update.

Some viruses take advantage of the similarity between the ". com " top-level domain and the ". COM " file extension by emailing malicious, executable command-file attachments under names superficially similar to URLs ( e. g., " myparty. yahoo. com "), with the effect that some naive users click on email-embedded links that they think lead to websites but actually download and execute the malicious attachments.

Some people describing themselves as hacktivists have taken to defacing websites for political reasons, such as attacking and defacing government websites as well as web sites of groups who oppose their ideology.

Some online communities are linked geographically, and are known as community websites.

# Some websites offer learning activities such as quizzes or puzzles to practice language concepts.

Some commercial websites object to other sites making deep links into their content either because it bypasses advertising on their main pages, passes off their content as that of the linker or, like The Wall Street Journal, they charge users for permanently valid links.

Some web sites allow users to post their list of bookmarks or favorites websites for others to search and view them.

Some churches require more.

Some established jurisdictions require adherence to design and historic preservation guidelines.

Some opcodes require one or more operands as part of the instruction, and most assemblers can take labels and symbols as operands to represent addresses and constants, instead of hard coding them into the program.

Some instances of exploring these " nearby " nodes require traversing up to 2 × log ( n ) links ( particularly when moving from the rightmost leaf of the root's left subtree to the leftmost leaf of the root's right subtree ).

Some contact adhesives require as long as 24 hours to dry before the surfaces are to be held together.

Some authors require in addition that μ ( C ) < ∞ for every compact set C. If a Borel measure μ is both inner regular and outer regular, it is called a regular Borel measure.

Some forms of Islamic law, as in Saudi Arabia, may require capital punishment, but there is great variation within Islamic nations as to actual capital punishment.

Some cities such as Seattle and San Francisco require food and yard waste to be sorted for composting.

Some casinos require all players to make a minimum Pass or Don't Pass bet whether they are currently shooting or not.

* Some such countries do not require tourist visas of citizens of other Commonwealth countries.

Some other cash registers require a numeric password or physical key to be used when attempting to open the till.

Some undergraduate courses require a team of 2 to 5 students to design, implement, and test a simple CPU in a FPGA in a single 15 week semester.

Some shotgun sports, such as skeet, use crossing targets presented in a narrow range of distance, and only require one level of choke.

Some of the roads in more rural area are rough and unpaved, and require a four-wheel drive vehicles.

Some holes may require a throw from a Drop Zone.

Some players will use mid-ranges as drivers, and there are tournaments that require players to use only mid-range discs.

Some digital synthesizers now exist in the form of " softsynth " software that synthesizes sound using conventional PC hardware, though they require careful programming and a fast CPU to get the same latency response as their dedicated equivalents.

Some programs offer programs with two pre-professional years followed by four professional years, while others require a four year undergraduate / bachelor's degree.

Some Protestant communities including most Lutheran churches practice closed communion and require catechetical instruction for all people before receiving the Eucharist.

Some authors also require the domain of the Euclidean function be the entire ring R ; this can always be accommodated by adding 1 to the values at all nonzero elements, and defining the function to be 0 at the zero element of R, but the result is somewhat awkward in the case of K. The definition is sometimes generalized by allowing the Euclidean function to take its values in any well-ordered set ; this weakening does not affect the most important implications of the Euclidean property.

Some definitions of epilepsy require that seizures be recurrent and unprovoked, but others require only a single seizure combined with brain alterations which increase the chance of future seizures.

Some patients, however, require polypharmacy, the use of two or more anticonvulsants.

Some of these risks may be self-insurable, while most will require the purchase of an insurance contract.

Some other weapons, such as crossbows, require the same license as is required for firearms.