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PROIV was originally developed as a Fourth-generation programming language (4GL), PROIV and other 4GL's aiming to simplify and reduce efforts to create and develop computer programs compared to third-generation programming languages (3GL) such as Cobol and Fortran.
PROIV's usual application domain is database-centric business applications.
PROIV programs consist of declarative/non-procedural specifications that control the overall structure of the program and database access and that have an implicit sequence of execution (which PROIV programmers refer to as the timing cycle). Procedural subroutines can be added by the programmer; these are written in a 3GL-like language which PROIV calls "Logic".
PROIV was ported to several different platforms by separate teams. Garg brought these ports together as one company, named Pro Computer Sciences (PCS) and headquartered in Laguna Hills, California. PCS was subsequently acquired by MDIS in 1988.
During the second half of the 1980s, a PROIV team entered in the 4GL Grand Prix contests of 1987, 1988 and 1990 and the product finished second on each occasion.
PROIV runs OS-independent application code in an OS-specific virtual machine, allowing a user application to run unaltered on different computing platforms. As of August 2021[update], Zellis claims support for PROIV on Microsoft Windows (workstation and server), Red Hat Linux, IBM AIX, and Oracle Solaris; with Oracle, SQL Server, PostgreSQL, and IBM C-ISAM as the database backend.[a][b]
The PROIV-supplied "GUI client", which renders the rich-client UI for applications written in PROIV, is based around ActiveX technology and works only on Windows client platforms. Consequently, the programmers' development environments supplied with more-recent PROIV releases also work only on a Windows client platform.
- Only very specific combinations of operating system and database versions are supported
- A different and wider range of operating systems were claimed to be supported by earlier PROIV versions, for example IBM mainframe operating systems in 1986.
- "About". PROIV. September 27, 2016.
- "About us | The Zellis story".
- Harsant 1989, p. 5.
- "Interactions with the PROIV Virtual Machine". proiv.com.
- Zellis 2021, p. 12.
- Garg 1986.
- "PROIV Virtual Machine and the Windows Front End (PROIV Client)". proiv.com.
- "Pro People to help alleviate congestion" (Press release). 24 August 2004. Archived from the original on 2007-03-05. Retrieved 2007-09-18.
- Garg, Sushi (10 November 1986). "When we advertised in Computerworld, we got hard-core numbers, qualified business prospects, and serious business opportunities". Computerworld. Vol. 20 no. 45. p. 122.
- Glovia (2021). "External Interface Facility" (PDF). Fujitu.com. Retrieved 29 September 2021.
- Harsant, John (31 October 1989). The construction of Computer Systems and the use of Fourth Generation Languages (PDF). Staple Inn Actuarial Society.
- Hurst, Rebecca (8 July 1987). "Users debate 4GL virtues". Computerworld Focus. 21 (27A). IDG Communications. p. 49-50.
- ICE(GB), ed. (1988). Proceedings - Institution of Civil Engineers: Design and construction. Part 1. 84. United Kingdom: Institution of Civil Engineers. p. 168.
- Zellis (September 2021). "PROIV Version 9.71 Release Notes". proiv.com. Retrieved 1 October 2021.