Windows Fundamentals
Windows is a family of operating systems that connects applications and user accounts to a computer's processor, memory, storage, network, and devices. Its desktop tools expose that system while background services, drivers, permissions, updates, and recovery features keep it working.
itWindows and Microsoft infrastructure | OpenSkills.info
Course pathWalk it in order
Look it upDip in anytime
Go furtherLeaves this page
Intro
Windows as an operating system
Windows is a family of operating systems for personal computers, workstations, and servers. An operating system sits between applications and hardware. It schedules work on the processor, assigns memory, stores data in file systems, controls devices through drivers, and enforces access rules. The Windows desktop, Start menu, File Explorer, Settings, and Task Manager are interfaces to that underlying system.
Modern Windows is built around the Windows NT architecture. Applications usually run in user mode, where a fault is contained within a process. Core operating-system components and many drivers run in kernel mode, where code can access protected memory and hardware. This separation limits what ordinary applications can do. A faulty kernel-mode driver can still destabilize the whole system because it operates inside the trusted boundary.
From power-on to a working desktop
Firmware initializes the computer and starts Windows Boot Manager. Windows loads the kernel, essential drivers, and system configuration. The Service Control Manager then starts services configured for boot or sign-in. After authentication, Windows creates a user session and an access token that represents the account and its group memberships. Explorer supplies the desktop, taskbar, Start menu, and File Explorer experience.
Opening an application creates a process with private virtual memory and one or more threads. The processor executes threads. The process requests operating-system services for files, network connections, windows, and devices. Windows evaluates the process token against each protected object's access control list before allowing access. A driver translates approved device operations into commands the hardware understands.
This path gives a useful mental model:
Continue the course
This section is part of the paid course.
See pricing to subscribe, or log in if you already have access.
Where this skill leads
Relevant careers
See how this topic contributes to broader role-level skill maps.
Sources
- https://support.microsoft.com/en-us/windows/
Supports
- Windows task areas for installation, updates, devices, files, security, accessibility, and repair
- Scope and progression of the Reference path
- https://learn.microsoft.com/en-us/windows/win32/com/processes--threads--and-apartments
Supports
- Processes as collections of virtual memory, code, data, and resources
- Threads as the execution sequences scheduled within processes
- Every process having at least one primary thread
- https://learn.microsoft.com/en-us/windows/win32/services/about-services
Supports
- Service Control Manager database and control role
- Windows services as managed background mechanisms
- Trigger-start and automatic service lifecycle distinctions
- https://learn.microsoft.com/en-us/windows/win32/system-services
Supports
- Windows APIs for memory, power, libraries, threads, service applications, system information, and component services
- Advanced Reference-path rationale
- https://learn.microsoft.com/en-us/windows-hardware/drivers/gettingstarted/what-is-a-driver-
Supports
- Drivers connecting operating-system requests to device operations
- Application, operating system, driver, and hardware request path
- Hardware and software drivers
- https://learn.microsoft.com/en-us/windows-hardware/drivers/kernel/types-of-windows-drivers
Supports
- User-mode and kernel-mode driver distinction
- Kernel-mode drivers operating with protected system components
- Layered device-driver request flow
- https://learn.microsoft.com/en-us/windows-server/storage/file-server/ntfs-overview
Supports
- NTFS as the default file system for modern Windows
- Metadata, logging, security descriptors, quotas, and encryption integration
- File and folder access control lists with granular permissions
- https://learn.microsoft.com/en-us/windows/win32/sysinfo/registry-functions
Supports
- Registry storage of small configuration values, preferences, and per-user state
- Preference for supported application-data stores for broader app data
- https://learn.microsoft.com/en-us/windows/security/identity-protection/access-control/local-accounts
Supports
- Local account scope and Windows internal service accounts
- Account and access-control context used in the course
- https://learn.microsoft.com/en-us/windows/win32/secauthz/access-control-components
Supports
- Successful sign-in creating an access token for the user
- Access tokens carrying account, group, and privilege information into processes
- Security descriptors and ACLs protecting securable objects
- https://learn.microsoft.com/en-us/windows/win32/secauthz/access-control-lists
Supports
- DACL entries granting or denying requested access to securable objects
- ACL evaluation when a process requests object access
- https://learn.microsoft.com/en-us/windows-hardware/drivers/install/installing-a-boot-start-driver
Supports
- Boot-start drivers required for devices needed to start Windows
- Missing storage drivers causing inaccessible boot-device and disk-discovery failures
- https://learn.microsoft.com/en-us/windows/security/application-security/application-control/user-account-control/
Supports
- Standard user tokens for routine application execution
- Consent prompt before administrator-level operations
- UAC reducing standing administrator access for applications
- https://learn.microsoft.com/en-us/windows/security/operating-system-security/data-protection/bitlocker/
Supports
- Full-volume encryption against offline access to lost or removed storage
- Difference between volume encryption and file-system authorization
- Recovery-key dependency and device encryption behavior
- https://learn.microsoft.com/en-us/windows/deployment/update/release-cycle
Supports
- Cumulative monthly security updates
- Optional preview, out-of-band, and annual feature update distinctions
- Annual feature updates establishing support lifecycle
- https://learn.microsoft.com/en-us/windows/deployment/update/servicing-stack-updates
Supports
- Servicing stack and component-based servicing roles
- Cumulative update behavior and combined servicing payloads
- https://learn.microsoft.com/en-us/windows/deployment/update/windows-update-security
Supports
- Windows Update delivery of operating-system updates, drivers, antivirus definitions, Microsoft Store apps, and other content
- Windows Update client and service request path
- https://learn.microsoft.com/en-us/lifecycle/faq/windows
Supports
- Supported Windows versions as a requirement for monthly quality updates
- Quality and feature update distinction
- https://support.microsoft.com/en-us/windows/experience/system-configuration-tools-in-windows
Supports
- Settings as the central supported configuration interface
- Task Manager views of processes, performance, startup applications, and users
- System Configuration and System Information diagnostic roles
- https://support.microsoft.com/en-us/windows/experience/startup-boot/configure-startup-applications-in-windows
Supports
- Per-user and machine startup application locations
- Task Manager startup view and startup-impact information
- https://support.microsoft.com/en-us/windows/experience/backup-recovery/recovery-options-in-windows
Supports
- Recovery choice by symptom
- Startup Repair, System Restore, Reset, and installation-media boundaries
- Need to back up data before recovery
- https://support.microsoft.com/en-us/windows/experience/backup-recovery/backup-restore-and-recovery-in-windows
Supports
- Backup, restore, transfer, and recovery distinctions
- Windows backup and recovery tool roles
- Reset, advanced startup, and Windows Recovery Environment behavior
- https://support.microsoft.com/en-us/windows/experience/backup-recovery/system-restore
Supports
- Restore points reverting system files, Registry settings, and installed programs
- System Restore not affecting personal files as a file backup would
- https://github.com/sindresorhus/awesome
Supports
- Discovery of the curated Awesome Windows list
- https://github.com/0PandaDEV/awesome-windows
Supports
- Discovery of PowerToys, Everything, Chocolatey, Rufus, and FreeFileSync
- Windows utility categories and learner-relevant project destinations
- https://learn.microsoft.com/en-us/windows/powertoys/
Supports
- PowerToys as free open-source utilities for Windows customization
- Window management, keyboard mapping, launcher, and file utility roles
- https://www.voidtools.com/support/everything/
Supports
- Everything as a Windows filename search engine
- Project documentation as the useful learner destination
- https://docs.chocolatey.org/en-us/getting-started/
Supports
- Chocolatey as a Windows software package manager
- Package installation, upgrade, uninstall, metadata, and dependency concepts
- https://rufus.ie/
Supports
- Rufus creation of bootable USB installation media
- Destructive replacement of target USB contents as an operational caution
- https://freefilesync.org/manual.php
Supports
- File and folder comparison and synchronization
- Synchronization as distinct from an independent backup strategy
- https://news.microsoft.com/de-de/features/windows-geschichte/
Supports
- Windows 1.0 retail release in 1985 as a graphical MS-DOS environment
- Windows 3.0, Windows 95, Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10, and Windows 11 milestones
- Start menu, taskbar, Plug and Play, NT lineage, and servicing-era changes
- https://news.microsoft.com/announcement/launch-of-windows-95/
Supports
- Windows 95 launch and introduction of the Start button, taskbar, long filenames, and Plug and Play
- https://blogs.windows.com/windowsexperience/2023/11/09/reflecting-on-20-years-of-windows-patch-tuesday/
Supports
- 2003 start of the predictable monthly Patch Tuesday process
- Trustworthy Computing origins and subsequent Windows security controls
- Windows 10 shift toward a service-based update model
- https://www.microsoft.com/en-us/microsoft-365/blog/2021/06/24/windows-11-the-operating-system-for-hybrid-work-and-learning/
Supports
- June 2021 Windows 11 announcement
- Redesigned Start experience and window Snap behavior
- https://www.microsoft.com/en-us/windows/windows-11
Supports
- Windows 11 product homepage for the desktop operating-system landscape
- https://www.apple.com/os/macos/
Supports
- macOS as Apple's current desktop operating-system product
- https://chromeos.google/
Supports
- ChromeOS as Google's cloud-oriented desktop operating-system product
- https://ubuntu.com/desktop
Supports
- Ubuntu Desktop as an open-source Linux desktop distribution
- Desktop installation, software, security, and support positioning
- https://fedoraproject.org/workstation/
Supports
- Fedora Workstation as a free open-source GNOME desktop
- Community updates, package sources, and hardware support positioning
- https://www.redhat.com/en/store/red-hat-enterprise-linux-workstation
Supports
- Red Hat Enterprise Linux Workstation as a paid supported workstation product
- Professional graphics, scientific, provisioning, and administration use