Go Komura

Japanese Font and Character Pitfalls — Handling JIS2004, Ideographic Variation Selectors, and Gaiji in Business Apps (archived 2026-09-08)

Character trouble in business systems sorts itself out once you separate character codes (data) from fonts (appearance). Covers JIS2004 glyph changes, IVS, and gaiji. Archived version of https://comcomponent.com/en/blog/japanese-fonts-jis2004-ivs-gaiji-business-apps/, as publishe...

DllMain and the Loader Lock — The Real Reason You Are Told to "Do Nothing in DLL Initialization" (archived 2026-09-08)

Why DllMain must not call LoadLibrary or wait on threads: the loader lock serializes DLL notifications, typical deadlocks, deferred initialization, and hang investigation. Archived version of https://comcomponent.com/en/blog/dllmain-loader-lock/, as published on 2026-09-08. The l...

Japanese Font and Character Pitfalls — Handling JIS2004, Ideographic Variation Selectors, and Gaiji in Business Apps (archived 2026-09-08)

Character trouble in business systems sorts itself out once you separate character codes (data) from fonts (appearance). Covers JIS2004 glyph changes, IVS, and gaiji. Archived version of https://comcomponent.com/en/blog/japanese-fonts-jis2004-ivs-gaiji-business-apps/, as publishe...

DllMain and the Loader Lock — The Real Reason You Are Told to "Do Nothing in DLL Initialization" (archived 2026-09-08)

Why DllMain must not call LoadLibrary or wait on threads: the loader lock serializes DLL notifications, typical deadlocks, deferred initialization, and hang investigation. Archived version of https://comcomponent.com/en/blog/dllmain-loader-lock/, as published on 2026-09-08. The l...

Windows Shutdown from the App's Point of View — Surviving Exit Notifications, Restarts, and Power Loss Correctly (archived 2026-09-08)

Data corrupted by a nightly Windows Update restart is preventable by design: WM_QUERYENDSESSION/PRESHUTDOWN notifications, cleanup in seconds, and power-loss-safe saves. Archived version of https://comcomponent.com/en/blog/windows-shutdown-handling-for-apps/, as published on 2026...

From Group Policy to Intune — A Device Management Migration Guide for Small and Medium Businesses (archived 2026-09-08)

AD server due for replacement: GPO or Entra ID plus Intune? How each applies, licensing, Group Policy analytics inventory, five migration stages, pitfalls for SMBs. Archived version of https://comcomponent.com/en/blog/gpo-to-intune-migration-guide-sme/, as published on 2026-09-08...

Japanese Font and Character Pitfalls — Handling JIS2004, Ideographic Variation Selectors, and Gaiji in Business Apps (archived 2026-09-08)

Separate character codes (data) from fonts (appearance) and character trouble in business systems sorts out. Covers JIS2004 glyph changes, IVS, and gaiji. Archived version of https://comcomponent.com/en/blog/japanese-fonts-jis2004-ivs-gaiji-business-apps/, as published on 2026-09...

Spurious Wakeups — Why a Condition Variable Wakes "Without a Notification" and How to Wait Correctly on Windows (archived 2026-09-08)

Condition variable waits can wake with no notification (spurious wakeups). Why Windows allows it, and the correct while-and-predicate wait in Win32, C++, and C#. Archived version of https://comcomponent.com/en/blog/windows-condition-variable-spurious-wakeup/, as published on 2026...

What "Not Responding" Really Is — How Windows Decides an App Has Hung, and How to Design Apps That Don't (archived 2026-09-08)

Windows marks a window Not Responding after 5 seconds without message retrieval and shows a ghost window: the check, hang causes, UI-thread design, and investigation. Archived version of https://comcomponent.com/en/blog/windows-app-not-responding-hang-mechanism/, as published on...

Windows App Accessibility Basics — UI Automation and Preparing for Mandatory Reasonable Accommodation (archived 2026-09-08)

How screen readers read Windows apps via UI Automation: WinForms/WPF naming, keyboard, contrast, and verification tools, under Japan's amended disability law (April 2024). Archived version of https://comcomponent.com/en/blog/windows-app-accessibility-ui-automation-guide/, as publ...

How the Clipboard and Drag & Drop Work — Handling OLE Data Transfer Correctly in Business Apps (archived 2026-09-08)

Why Excel pastes break and paste fails once the source closes: clipboard formats, delayed rendering, OLE drag and drop, and clipboard history and cloud sync policies. Archived version of https://comcomponent.com/en/blog/windows-clipboard-drag-drop-ole-data-transfer/, as published...

Apps That Break on Resume from Sleep — How Power Events Work and How to Build Business Apps That Survive Resume (archived 2026-09-08)

Why business apps break after a laptop resumes from sleep: WM_POWERBROADCAST notifications, Modern Standby, reconnect design, sleep suppression, and powercfg. Archived version of https://comcomponent.com/en/blog/windows-sleep-resume-power-events/, as published on 2026-09-08. The...

From Group Policy to Intune — A Device Management Migration Guide for Small and Medium Businesses (archived 2026-09-08)

AD server due for replacement: GPO or Entra ID plus Intune? How each applies, licensing, Group Policy analytics inventory, five migration stages, pitfalls for SMBs. Archived version of https://comcomponent.com/en/blog/gpo-to-intune-migration-guide-sme/, as published on 2026-09-08...

Windows App Accessibility Basics — UI Automation and Preparing for Mandatory Reasonable Accommodation (archived 2026-09-08)

How screen readers read Windows apps via UI Automation: WinForms/WPF naming, keyboard, contrast, and verification tools, under Japan's amended disability law (April 2024). Archived version of https://comcomponent.com/en/blog/windows-app-accessibility-ui-automation-guide/, as publ...

WPR/WPA in Practice — A Primer on Investigating "the Whole PC Is Slow" Across the Entire System (archived 2026-09-08)

Investigate a slow PC or slow startup that Task Manager cannot explain with an OS-wide ETW trace: capture with wpr.exe, then read CPU, waits, and disk I/O in WPA. Archived version of https://comcomponent.com/en/blog/wpr-wpa-system-performance-analysis/, as published on 2026-09-08...

The Depths of Windows Virtualization (Part 2) — Memory Even the Kernel Cannot See: How VBS, HVCI, and Credential Guard Work (archived 2026-09-07)

Enabled by default on a clean install to compatible hardware, VBS uses the hypervisor and SLAT to isolate beyond the kernel. Covers VTLs, the Secure Kernel, HVCI, and Credential Guard. Archived version of https://comcomponent.com/en/blog/windows-virtualization-internals-vbs-hvci-...

Does Turning Off Memory Integrity (HVCI) Make Windows Faster? — What It Means, How to Do It, and How to Decide (archived 2026-09-07)

Does turning off Memory integrity (HVCI) really speed up a Windows PC? When it can help, when it cannot, how to switch it off and back, and how to decide. Archived version of https://comcomponent.com/en/blog/windows-memory-integrity-hvci-off-performance/, as published on 2026-09-...

The Win32 Thread Pool API — Concurrency That Does Not Create Threads, with CreateThreadpoolWork (archived 2026-09-07)

Calling CreateThread everywhere in native code? A primary-source guide to the Win32 thread pool API: the work, timer, wait, and io objects, cleanup groups, and callback rules. Archived version of https://comcomponent.com/en/blog/win32-thread-pool-api/, as published on 2026-09-07....

The "Same PC" Is Not the Same Execution Environment — The User Boundary That Separates AppData, HKCU, DPAPI, and Credentials (archived 2026-09-07)

Why an app that works on your desk breaks as a task or service: how the Windows user boundary separates AppData, HKCU, DPAPI, browser profiles, and credentials. Archived version of https://comcomponent.com/en/blog/windows-user-boundary-appdata-hkcu-dpapi/, as published on 2026-09...

The Depths of Windows Virtualization (Part 3) — Virtual Machines That Boot in Seconds: Why WSL2, Windows Sandbox, and Containers Are So Light (archived 2026-09-07)

Why WSL2 and Windows Sandbox boot in seconds and stay light: dynamic base images, direct map, dynamic memory allocation, and Hyper-V isolated containers explained. Archived version of https://comcomponent.com/en/blog/windows-virtualization-internals-wsl2-sandbox-containers/, as p...