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How to design and implement a stripped-down version of an interpreter for the BASIC language was covered in articles by Allison in the first three quarterly issues of the People's Computer Company newsletter published in 1975 and implementations with source code published in Dr. Dobb's Journal of Tiny BASIC Calisthenics & Orthodontia: Running Light without Overbyte.

Some Unix-based implementations ( CLISP, SBCL ) can be used as a scripting language ; that is, invoked by the system transparently in the way that a Perl or Unix shell interpreter is.

In the 1970s, analysis of high level languages indicated some complex machine language implementations and it was determined that new instructions could improve performance.

Two other groups contributed to the design of the language and developed implementations: Harlequin released a commercial IDE for Microsoft Windows and Carnegie Mellon University released an open source compiler for Unix systems.

Four other open source implementations are available: " The Eiffel Compiler " tecomp, Gobo Eiffel, SmartEiffel — the GNU implementation, based on an older version of the language — and Visual Eiffel.

The Scheme language standard requires implementations to recognize and optimize tail recursion.

Some Forth implementations ( usually early versions or those written to be extremely portable ) compile threaded code, but many implementations today generate optimized machine code like other language compilers.

Interpreting a language gives implementations some additional flexibility over compiled implementations.

Two implementations of KRC were written: David Turner's original one in BCPL running on EMAS, and Simon Croft's later one in C under Unix, and KRC was the main language used for teaching functional programming at the University of Kent at Canterbury ( UK ) from 1982 to 1985.

It was developed by David May and others at INMOS, advised by Tony Hoare, as the native programming language for their transputer microprocessors, but implementations for other platforms are available.

While OBE implementations often incorporate a host of many progressive pedagogical models and ideas, such as reform mathematics, block scheduling, project-based learning and whole language reading, OBE in itself does not specify or require any particular style of teaching or learning.

Most programming languages have an associated core library ( sometimes known as the ' standard library ', especially if it is included as part of the published language standard ), which is conventionally made available by all implementations of the language.

Many language specifications define a core that must be made available in all implementations, and in the case of standardized languages this core library may be required.

Most implementations of the relational model use the SQL data definition and query language.

( For performance reasons, implementations may recognize and treat as special some of those messages ; however, this is only an optimization and is not hardwired into the language syntax.

In June 1967 a conference was held to standardize the language and initiate a number of implementations.

Some of this power derives from the so-called " SPITBOL extensions " ( which have since been incorporated in basically all modern implementations of the original SNOBOL 4 language too ), although it is possible to achieve the same power without them.

Currently, there are two open source alternative implementations of Turing: Open Turing, an open source version of the original interpreter, TPlus, a native compiler for the concurrent systems programming language variant Turing Plus, and OpenT, an abandoned project to develop a compiler for Turing.

While most of these are games, the library includes programming language implementations, databases ( e. g. VU-File ), word processors ( e. g. Tasword II ), spreadsheets ( e. g. VU-Calc ), drawing and painting tools ( e. g. OCP Art Studio ), and even 3D-modelling ( e. g. VU-3D ) and archaeology software amongst many other types.

The edit / compile / run cycle was fast compared to other Pascal implementations because everything related to building the program was stored in RAM, and because it was a one-pass compiler written in assembly language.

However, the CSS algorithm seems to require more characters to describe in a computer programming language than the RSA algorithm ; one of the shortest implementations of DeCSS ( called " efdtt ") is 434 bytes.

Early implementations were for the DEC PDP-7 and PDP-11 minicomputers using early Unix, and Honeywell 36-bit mainframes running the operating system GCOS.

Furthermore there are implementations for various other operating systems, such as Atari-TOS or AmigaOS.

Many implementations of C and C ++ provide support for threading on their own, but also provide access to the native threading APIs provided by the operating system.

Other tools like awk can also be considered glue languages, as can any language implemented by an ActiveX WSH engine ( VBScript, JScript and VBA by default in Windows and third-party engines including implementations of Rexx, Perl, Tcl, Python, XSLT, Ruby, Delphi, & c ) A majority of applications can access and use operating system components via the object models or its own functions.

Other devices like programmable calculators may also have glue languages ; the operating systems of PDAs such as Windows CE may have available native or third-party macro tools that glue applications together, in addition to implementations of common glue languages — including Windows NT, MS-DOS and some Unix shells, Rexx, PHP, and Perl.

Third-party implementations of more comprehensive Basic version that may be closer to variants listed as glue languages in this article are available — and attempts to implement Perl, Rexx, or various operating system shells on the TI and HP graphing calculators are also mentioned.

A variety of grep implementations is available in many operating systems and software development environments.

Intermediate representations such as bytecode may be output by programming language implementations to ease interpretation, or it may be used to reduce hardware and operating system dependence by allowing the same code to run on different platforms.

However, many normal applications obviously need access to these components, so system calls are made available by the operating system to provide well-defined, safe implementations for such operations.

Other operating systems can avail themselves of either of two free implementations, iODBC or unixODBC.

Although UUCP was originally developed on Unix and is most closely associated with Unix-like systems, UUCP implementations exist for several non-Unix-like operating systems, including Microsoft's MS-DOS, Digital's VAX / VMS, Commodore's AmigaOS, classic Mac OS, and even CP / M.

Open source implementations supporting MAC addresses on several common operating systems are UUID – generate UUIDs ( or GUIDs ) in Java and Java Uuid Generator ( JUG ).

Since 2006, researchers have applied RCU and similar techniques to a number of problems, including management of metadata used in dynamic analysis, managing the lifetime of clustered objects, managing object lifetime in the K42 research operating system, and optimizing software transactional memory implementations.

32-bit versions of MFC, for Windows NT 3. 1 and later Windows operating systems, used compilers that implemented the language features and updated the macros to simply wrap the language features instead of providing customized implementations, realizing upward compatibility.

The JACK API is standardized by consensus, and two compatible implementations exist: jack1, which is implemented in plain C and has been in maintenance mode for a while, and jack2 ( originally jackdmp ), a re-implementation in C ++ led by Stéphane Letz, which is under aggressive development and has introduced multi-processor scalability and support for operating systems other than Linux.

The PenPoint operating system had novel early implementations of several computing advances, including:

The game has software implementations as computer puzzle game for various computer operating systems ( through the Python language ), mobile phones and PDAs, as well as a board game variant.

The reference implementations for CDC profiles are based on Linux running on an Intel-compatible PC, and optimized implementations are available for a variety of other CPUs and operating systems.

Curses is most commonly associated with Unix-like operating systems, although implementations for Microsoft Windows also exist.

Many implementations of message queues function internally: within an operating system or within an application.

Other implementations allow the passing of messages between different computer systems, potentially connecting multiple applications and multiple operating systems.

Traditionally, many operating systems and their underlying file system implementations used 32-bit integers to represent file sizes and positions.

Notably, PRISM included Epicode ( extended processor instruction code ), which defined a number of " special " instructions intended to offer the operating system a stable ABI across multiple implementations.