In the outbreak of commercial operating systems, protagonism may be seen as an extreme form of brand loyalty in which customers come thus devoted to the product it devote their spare instance to its protagonism. Protagonism is as well one of a most common interest of victims world health organization have a deep & imperishable interest in the project, construction & usage of operating systems. For these population, the investment necessary -- each inside money & period -- to have & work a computer periodically creates an emotional investment in their operating system of choice. Such emotional ties might lead to protagonism that can cause emotional arguments when humans compare & counterpoint a virtues & faults of different operating systems.

Jeff Kirvin characterized a "PalmOS versus Windows Mobile" operating formulas protagonism debates of 2004 as "Ford versus Chevy" debates.¹

There are related wars above programming languages, video game consoles, and text editors (Emacs vs vi; see editor war). Usenet
There are many Usenet newsgroups devoted to operating system protagonism: [news:///comp.os.linux.protagonism comp.os.linux.advocacy] — advocacy on to Linux [news:///comp.os.ms-windows.protagonism comp.os.ms-windows.advocacy] — advocacy on to Microsoft Windows [news:///comp.os.ms-windows.nt.protagonism comp.os.ms-windows.nt.advocacy] — advocacy on to Windows NT [news:///comp.os.os2.protagonism comp.os.os2.advocacy] — advocacy on to OS/2 [news:///comp.sys.acorn.advocacy comp.sys.acorn.advocacy] [news:///comp.sys.amiga.advocacy comp.sys.amiga.advocacy] [news:///comp.sys.atari.advocacy comp.sys.atari.advocacy] [news:///comp.sys.be.protagonism comp.sys.be.advocacy] — advocacy on to BeOS [news:///comp.sys.mac.advocacy comp.sys.mac.advocacy] [news:///comp.sys.next.advocacy comp.sys.next.advocacy] [news:///comp.sys.powerpc.advocacy comp.sys.powerpc.advocacy] [news:///comp.unix.advocacy comp.unix.advocacy] [news:///de.comp.os.os2.advocacy de.comp.os.os2.advocacy] [news:///de.comp.sys.amiga.advocacy de.comp.sys.amiga.advocacy] [news:///ecomstation.protagonism ecomstation.advocacy] — advocacy on to eComStation [news:///gmane.os.bsd.protagonism gmane.os.bsd.advocacy] — advocacy on to BSD [news:///gmane.os.freebsd.protagonism gmane.os.freebsd.advocacy] — advocacy on to FreeBSD [news:///gmane.os.netbsd.protagonism gmane.os.netbsd.advocacy] — advocacy on to NetBSD [news:///gmane.os.openbsd.protagonism gmane.os.openbsd.advocacy] — advocacy on to OpenBSD [news:///pl.comp.os.advocacy pl.comp.os.advocacy]

For many one newsgroups, a separate .protagonism newsgroup was created sequentially to keep operating models protagonism postings away from a lot of the more newsgroups in the hierarchy for the relevant operating formulas. A Conclusion to the Windows newsgroups^Deuce, for instance, exhorts Usenet posters to non "get involved in arguments about Windows vs. OS/2 vs. Macintosh vs. NeXTSTEP except in the comp.os.ms-windows.advocacy group" & to does'nt post (& to does'nt watch-higher any more posts in) any operating patterns comparisons or even arguments all about operating systems in any more newsgroups.

Operating patterns protagonism discussions in Usenet, & elsewhere, use at times spawned the total of specialised jargon terms to characterize various behaviours commonly seen within such discussions, like "MicroDroid"^Three & "Amiga Persecution Complex"^Four.

A perceived blackball characterizations associated using operating models advocates use led various population to produce guidelines for what it assume to exist as caring protagonism, like a Linux Advocacy Guidelines^Five & a Guidelines for Real life OS/2 Advocacy⁶. Notable advocates
On this button come occasionally operating rules advocates world health organization come published authors, along sustaining what operating systems it advocate: Dru Lavigne — a writer for ONLamp and advocate of FreeBSD Specific operating systems

Mac advocacy
Linux advocacy
Nikolai Bezroukov hwhen written an extensive critique, 1st published as deuce papers within First Monday, of the Linux advocacy techniques utilized by Eric S. Raymond, Linus Torvalds, and others, in which he criticizes "bad Linux advocacy" and "Raymondism" on nine grounds:⁷