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====== 2.2.1.1.1 Platform Interface ======
[[dido:public:ra:1.2_views:2_tech_views:1_core:1_interface|return to Interfaces ]]

A **Platform** is the computing environment that software resides-in and executes-on. In the DIDO context, the software is the [[dido:public:ra:xapend:xapend.a_glossary:d:dapp]] that runs on a particular [[dido:public:ra:xapend:xapend.a_glossary:d:dido_platform|DIDO Platform]] (i.e., [[dido:public:ra:xapend:xapend.a_glossary:b:bitcoin|Bitcoin]], [[dido:public:ra:xapend:xapend.a_glossary:e:ethereum|Ethereum]], IOTA, IPFS, DDS, etc). The DIDO [[dido:public:ra:xapend:xapend.a_glossary:p:platform|Platform]] is comprised of the following abstractions:
 
  - the computer hardware (real or virtual)
  - The [[dido:public:ra:xapend:xapend.a_glossary:o:os]]
  - other layers of software used to support the [[dido:public:ra:xapend:xapend.a_glossary:a:application|application]] (DIDO Platform)

The first layer, the Operating System, abstracts access to the actual hardware such as memory, disks, networks etc. by providing [[dido:public:ra:xapend:xapend.a_glossary:a:api]] for applications to use. In other words, the application is tied to the OS rather than a particular hardware configuration. However, this still ties an application to an OS.

The second layer of abstraction occurs when the [[dido:public:ra:xapend:xapend.a_glossary:i:interface|interface]] to the OS becomes standardized, as it is with the IEEE Portable Operating System Interface (POSIX) 1003.1-2016(( IEEE Std 1003.1, 2016 Edition, IEEE Standard for Information Technology - [[dido:public:ra:xapend:xapend.a_glossary:p:posix|Portable Operating System Interface (POSIX)]], includes IEEE Std 1003.1-2008, IEEE Std 1003.1-2008/Cor 1-2013, IEEE Std 1003.1-2008/Cor 2-2016.
)). The POSIX standard supports applications [[dido:public:ra:xapend:xapend.a_glossary:p:portability|portability]] at the [[dido:public:ra:xapend:xapend.a_glossary:s:sourcecode|source code]] level and includes provisions for a standard operating system interface and environment, including a command interpreter (or "shell"), and common utility programs.((
POSIX Product Standards, 1003.1-2016 Base, [[http://get.posixcertified.ieee.org/docs/base-2016.html]]
))

The third layer (DIDO Platform) provides an API for a Distributed Application (DAPP) to reside-in and execute-on. Access to the other DIDO components is tightly controlled for security reasons. Unfortunately at this time, there is no standardized abstraction for DIDO Platforms.

**Note:** A DIDO Node within the DIDO Network provides a platform or subsetted platform so that DApps can be run on each [[dido:public:ra:xapend:xapend.a_glossary:n:node|node]]. 

===== Standards =====
==== Technical Standards ====
  * None at this time

==== de facto Standards ====
  * [[dido:public:ra:xapend:xapend.b_stds:defact:bitcoin:guides]]
  * [[dido:public:ra:xapend:xapend.b_stds:defact:bitcoin:dev_guides]]
  * [[dido:public:ra:xapend:xapend.b_stds:defact:ethereum:client:cpp]]
  * [[dido:public:ra:xapend:xapend.b_stds:defact:ethereum:client:ethereumh]]
  * [[dido:public:ra:xapend:xapend.b_stds:defact:ethereum:client:ethereumjs-lib]]
  * [[dido:public:ra:xapend:xapend.b_stds:defact:ethereum:client:ethereum_j]]
  * [[dido:public:ra:xapend:xapend.b_stds:defact:ethereum:client:go-ethereum]]
  * [[dido:public:ra:xapend:xapend.b_stds:defact:ethereum:client:parity]]
  * [[dido:public:ra:xapend:xapend.b_stds:defact:ethereum:client:pyethapp]]
  * [[dido:public:ra:xapend:xapend.b_stds:defact:ethereum:client:ruby-ethereum]]

===== Tools =====
  * None at this time

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