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It was created in 1987 by Miroslav Trnka and Peter Paško at the time when computer viruses started to become increasingly prevalent on PCs running DOS.
Due to the limitations of the OS (lack of multitasking among others) it didn't feature any on-demand/on-access protection nor most of the other features of the current versions.
ESET Sys Inspector is a diagnostic tool which allows in-depth analysis of various aspects of the operating system, including running processes, registry content, startup items and network connections.
Anti-Stealth Technology is used to discover hidden objects (rootkits) in the Master Boot Record, boot sector, registry entries, drivers, services and processes.
Sys Inspector Logs are standard XML files and can be submitted to IT experts for further analysis.
Two logs can be compared to find a set of items not common to both logs.
The program is offered free of charge, and can download updates if a network connection is present.
On June 1, 2010, the first release candidate for ESET File Security for Microsoft Windows Server v4.3 was made available to the public.
The Business Edition packages add ESET Remote Administrator allowing for server deployment and management, mirroring of threat signature database updates and the ability to install on Microsoft Windows Server operating systems.
The first version of NOD32 - called NOD-ICE - was a DOS-based program.
On October 2, 2014, ESET Smart Security version 8.0 was released.