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  2. Windows on Windows - Wikipedia

    en.wikipedia.org/wiki/Windows_on_Windows

    There is a similar subsystem, known as WoW64, on 64-bit Windows versions that runs 32-bit programs. This subsystem has since been discontinued as of 2021. The last version of Windows to include this subsystem is Windows 10 , as Windows 11 (and Windows Server 2008 R2 and later) dropped support for 32-bit processors and therefore cannot run 16 ...

  3. Windows API - Wikipedia

    en.wikipedia.org/wiki/Windows_API

    One of the largest changes to the Windows API was the transition from Win16 (shipped in Windows 3.1 and older) to Win32 (Windows NT and Windows 95 and up). While Win32 was originally introduced with Windows NT 3.1 and Win32s allowed use of a Win32 subset before Windows 95, it was not until Windows 95 that widespread porting of applications to ...

  4. Client/Server Runtime Subsystem - Wikipedia

    en.wikipedia.org/.../Client/Server_Runtime_Subsystem

    The Client/Server Runtime Subsystem, or csrss.exe, is a component of the Windows NT family of operating systems that provides the user mode side of the Win32 subsystem.In modern versions of Windows, it is primarily involved with process and thread management, console window handling, side-by-side assembly loading and the shutdown process.

  5. Environmental subsystem - Wikipedia

    en.wikipedia.org/wiki/Environmental_subsystem

    They allow the operating system to run software developed for the platform in question. For example, Windows NT 4.0 has four environmental subsystems, for example Win32, DOS or Win16, OS/2, and POSIX, the latter of which is a Unix standard. [1] The latter resides primarily in the Dynamic Link Library posix.dll.

  6. Microsoft Windows library files - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Windows_library...

    Applications that are linked directly against this library are said to use the native subsystem; the primary reason for their existence is to perform tasks that must run early in the system startup sequence before the Win32 subsystem is available. An obvious but important example is the creation of the Win32 subsystem process, csrss.exe. Before ...

  7. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you. These messages are sent automatically and often include the reason for the delivery failure.

  8. Explicit Congestion Notification - Wikipedia

    en.wikipedia.org/wiki/Explicit_Congestion...

    ECN allows end-to-end notification of network congestion without dropping packets. ECN is an optional feature that may be used between two ECN-enabled endpoints when the underlying network infrastructure also supports it. Conventionally, TCP/IP networks signal congestion by dropping packets.

  9. Fix sending and receiving issues with third-party email apps

    help.aol.com/articles/cant-send-or-receive-email...

    If your account is working on a web browser and you made sure you're using the right server settings, then update your email app to the newest version available. If you're still experiencing issues with your app, contact the manufacturer. Also, access your AOL Mail on a web browser. Keep in mind - For two-step verification, generate an app ...