Blog
Practical articles from KomuraSoft LLC about website development, SEO, Google Ads, Windows development, legacy asset reuse, and bug investigation.
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Getting a Real Feel for the OSI Model — Dissecting a Single HTTP Request Into Its Seven Layers
Understand the OSI model through the real thing instead of rote memorization. We assemble and dissect, in C#, the Ethernet frame carrying a single HTTP GET r...
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How to Think About Windows Session Isolation — Session 0, RDP, and Running Multiple Users Concurrently
This article untangles the concept of a Windows "session," a topic that consistently confuses Windows app developers. It covers why Session 0 isolation exist...
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Extending the Life of and Migrating VB6 / Access Business Apps — A Decision Table for Keep, Wrap, or Replace
How do you decide whether to leave a VB6 application or Microsoft Access business app as-is, extend its life by wrapping only part of it, or replace it outri...
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Reading Crash Dumps with WinDbg + SOS — A Practical Guide to Analysis After Collection
Explains how to actually read a collected Windows crash dump using WinDbg and the SOS extension. Covers symbol path configuration, tracking exceptions and me...
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Preventing Multiple Instances of a Windows App — Named Mutexes and Activating the Existing Window on a Second Launch
This article organizes the classic requirement for business Windows apps — 'don't let the same app launch twice' — around a named Mutex. We cover the pitfall...
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Safely Calling Win32 APIs from C# — A Practical P/Invoke Guide (DllImport / LibraryImport / CsWin32)
A practical rundown of what to watch for when calling Win32 APIs and native DLLs from C# via P/Invoke. Covers the differences between DllImport and LibraryIm...
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Integrating Entra ID Authentication into WinForms/WPF Apps — A Practical Architecture with MSAL.NET and the WAM Broker
A practical, hands-on look at integrating Entra ID (formerly Azure AD) authentication into WinForms/WPF desktop apps: the public client mindset, where ROPC s...
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Date, Time, and Timezones in Business Apps — From DateTime Pitfalls to the UTC-Storage Principle and Test Design
Timestamps drift by nine hours after a server migration; only the overseas office's dates roll back to the previous day — we trace date/time incidents back t...
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UI Automated Testing for Windows Desktop Apps — How UI Automation Works and Building Robust Tests with FlaUI
A practical guide to UI automated testing for WinForms/WPF apps, working from how Windows UI Automation itself works (the tree, AutomationId, control pattern...
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WPF High-DPI Support — Why It Still Blurs and Bleeds Despite Being 'Supposedly DPI-Aware,' and How to Fix It
WPF lays out UI in DIPs (1/96 inch) and is System DPI Aware from the start, but moving a window to a monitor with a different DPI blurs the whole screen, and...