page_title: DOS extender
hierarchical_section_title: DOS extender
caption_attribution_description: English: Screenshot of the DOS/4GW DOS extender, version 1.97.
context_page_description: A DOS extender is a computer software program running under DOS that enables software to run in a protected mode environment even though the host operating system is only capable of operating in real mode.
  DOS extenders were initially developed in the 1980s following the introduction of the Intel 80286 processor, to cope with the memory limitations of DOS.
context_section_description: A DOS extender is a computer software program running under DOS that enables software to run in a protected mode environment even though the host operating system is only capable of operating in real mode.
  DOS extenders were initially developed in the 1980s following the introduction of the Intel 80286 processor (and later expanded upon with the Intel 80386), to cope with the memory limitations of DOS.
caption: Tenberry Software's DOS/4GW startup banner
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