System (from the Latin (systēma), and this from the Greek σύστημα (sustēma)) is an assemblage of element comprising a whole with each element related to other elements. Any element which has no relationship with any other element of the system, cannot be a part of that system. A subsystem is then a set of elements which is a proper subset of the whole system.
Every division of an object/entity into systems is arbitrary, therefore it is a subjective abstract concept. The scientific research field which is engaged in the transdisciplinary study of universal systemic properties of the World is the General System Theory or Systems science, it investigates the abstract properties of the matter and mind, their organization, searching concepts and principles which are independent on the specific domain, independent of their substance, type, or spatial or temporal scales of existence.
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e-Lock PKI - A certificate issuance system that is integrated with CryptoAPI. [Free] (e-Lock)
Meta Description: [ PKI based digital signatures and electronic signatures for Internet security. Digital signing encryption and verification for MS Office and Adobe Acrobat documents. ]
Entrust/PKI - A certificate issuance system for Windows NT, HP-UX, Solaris, and AIX. (Entrust)
Meta Description: [ PKI - Entrust's first public-key infrastructure - the world's first commercially available PKI - was released in 1994. ]
pyCA - Python software for running a certificate authority on UNIX. [Free / Open Source] (Michael Ströder)
Meta Description: [ pyCA: Software for running a X.509/PKIX certificate authority ]
Red Hat Certificate System - Based on system acquired from Netscape. Supports deployment and maintenance of PKI solutions including the issue and revocation of digital certificates. [Red Hat Linux, Solaris]
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UniCERT - A componentized certificate authority system for Windows NT. It is capable of issuing SSL, S/MIME, IPSEC, SET, custom certificates, the delivery method can be e-mail, web, face-to-face. (Baltimore)
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