Some apps such as Microsoft Office are available in versions for several different platforms ; others have narrower requirements and are thus called, for example, a Geography application for Windows or an Android application for education or Linux gaming.

Some, like VirtualBox and VMware Player run on Windows and Linux hosts and can run many other operating systems.

Some Linux distributions have enabled privacy extensions as well.

Some Id Software titles ported to Linux are Doom ( the first Id Software game to be ported ), Quake, Quake II, Quake III Arena, Return to Castle Wolfenstein, Wolfenstein: Enemy Territory, Doom 3, Quake 4, and Enemy Territory: Quake Wars.

Some installations use Linux for zSeries to run Web servers, where Linux runs as the operating system within many virtual machines.

Some are PulseAudio, Advanced Linux Sound Architecture ( ALSA ), Open Sound System ( OSS ), and JACK Audio Connection Kit ( JACK ).

Some secure cryptoprocessors can even run general-purpose operating systems such as Linux inside their security boundary.

Some operating systems such as Linux and Mac OS X have virtual drive functionality built-in ( such as the loop device ), while others such as Microsoft Windows require additional software.

Some " generic " GDI drivers have been written which make some GDI printers compatible with non-Microsoft operating systems such as Linux, but there is no guarantee that any particular GDI printer will be supported.

Some related utilities are available for Mac OS X and Linux.

Some Linux distributions also use a derivative of ash as the default shell, although Bash ( Bourne Again Shell ) is more popular.

Some operating systems, such as OpenBSD with its W ^ X feature, and Linux with the Exec Shield or PaX patches, may also limit the length of the code segment, as specified by the CS register, to disallow execution of code in modifiable regions of the address space.

Some Unix as well as Linux distributions use symbolic links extensively in an effort to reorder the file system hierarchy.

Some operating systems, such as Mac OS X and some Linux distributions, allow administrator accounts which provide greater access while shielding the user from most of the pitfalls of full root access.

Some examples are Window Maker ( which emulates the look and feel of the NeXTstep GUI ), Docky, and Avant Window Navigator, KXDocker ( amongst others ) for KDE and various other gdesklet / adesklets docks, AfterStep's Wharf ( a derivation from the NeXTstep UI ), iTask NG ( a module used with some Enlightenment-based Linux distributions such as gOS ) and Blackbox's Slit.

Some of the " more prominent organizations " involved in OSS development include the Apache Software Foundation, creators of the Apache web server ; a loose affiliation of developers headed by Linus Torvalds, creators of the Linux operating system kernel ; the Eclipse Foundation, home of the Eclipse software development platform ; the Debian Project, creators of the influential Debian GNU / Linux distribution ;

Some are skinable ; The open source Icebreaker's default skin varies radically from JezzBall, using Tux, the Linux mascot, in place of balls.

Some Unix, BSD, and Linux distributions also include DNS-SD functionality.

Some calculators, especially those with other PDA-like functions have actual operating systems including the TI proprietary OS for its more recent machines, MS-DOS, Windows CE, and rarely Windows NT 4. 0 Embedded et seq, and Linux.

Some companies currently manufacturing devices, such as the pcHDTV devices intended for the Linux market, would likely be forced to halt production.

Some have had partial success decoding it using audio tape recorder heads, laptop sound cards, and custom Linux software.

Some Linux users run Linux-based anti-virus software to scan insecure documents and email which comes from or is going to Windows users.

Some weapons systems have become obsolescent while still in production, and some while still under development.

Some phonetic features, for example glottal catch or murmur, are sometimes to be assigned to segmental phonemics and sometimes to accentual systems.

Some school systems provide written instructions to principals and teachers designating when certain information is to be recorded on cumulative record forms and explaining how the information is to be summarized and used.

Some US School districts and systems return to school in August.

Some belief systems, such as those in the Abrahamic tradition, hold that the dead go to a specific plane of existence after death, as determined by a god, gods, or other divine judgment, based on their actions or beliefs during life.

Some, like Hernando De Soto, argue that much of the poverty in the Third World countries is caused by the lack of Western systems of laws and well-defined and universally recognized property rights.

Some home sewage treatment systems use biological treatment, usually beds of plants and aquaria, that absorb nutrients and bacteria and convert greywater and sewage to clear water.

Some systems are vacuum-insulated, acting something like large thermos bottles.

Some proven intensive, low-effort food-production systems include urban gardening ( indoors and outdoors ).

Some systems used a CD-ROM drive to make the files available.

Some bicycle parts, particularly hub-based gearing systems, are complex, and many cyclists prefer to leave maintenance and repairs to professional bicycle mechanics.

Some systems have proposed as many as 90 subspecies, while recent DNA analysis has identified as few as five clades.

Some modern editing systems can use OCR techniques to read BITC in situations where other forms of timecode are not available.

Some linguists, such as John DeFrancis and J. Marshall Unger have argued that genuine ideographic writing systems with the same capacities as natural languages do not exist.

Some writing systems of the world, notably the Arabic and Hebrew scripts, and derived systems such as the Urdu, Persian, Yiddish, Jawi, and Ladino scripts, are written in a form known as right-to-left ( RTL ), in which writing begins at the right-hand side of a page and concludes at the left-hand side.

Some systems used both codes and ciphers in one system, using superencipherment to increase the security.

Some take the approach of looking for coherent justifications of established copyright systems, while others start with general ethical theories, such as utilitarianism and try to analyse policy through that lens.

Some critics of this approach feel that while these models approach biological reality as a representation of how the system works, they lack explanatory powers because complicated systems of connections with even simple rules are extremely complex and often less interpretable than the system they model.

Some jurisdictions give priority to motorized traffic, for example setting up one-way street systems, free-right turns, high capacity roundabouts, and slip roads.

Some masters use different systems, or even no system at all.

Some light rail systems may run on a narrower gauge.

Some missiles can be fitted with any of a variety of navigation systems ( Inertial navigation, TERCOM, or satellite navigation ).

Some GC systems allow such other resources to be associated with a region of memory that, when collected, causes the other resource to be reclaimed ; this is called finalization.