Editing Windows 9x (section)

====User mode====
The user-mode parts of Windows 9x consist of three subsystems: the Win16 subsystem, the Win32 subsystem and MS-DOS.<ref>{{Cite web|url=http://www.microsoft.com/technet/archive/win95/rk31_arc.mspx?mfr=true|title=Windows 95 Architecture Components|website=[[Microsoft Technet]]|publisher=[[Microsoft]]|archive-url=https://web.archive.org/web/20080207122429/http://www.microsoft.com/technet/archive/win95/rk31_arc.mspx?mfr=true|archive-date=February 7, 2008|access-date=April 20, 2019}}</ref>

Windows 9x/Me set aside two blocks of 64 [[KiB]] memory regions for [[Graphics Device Interface|GDI]] and heap resources. By running multiple applications, applications with numerous GDI elements or by running applications over a long span of time, it could exhaust these memory areas. If free system resources dropped below 10%, Windows would become unstable and likely crash.<ref>{{Cite web|url=http://www.apptools.com/rants/resources.php|title=Resource Management Under Microsoft Windows|last=White|first=Gary|website=www.apptools.com|access-date=April 20, 2019}}</ref>