VBA / Office

Can you create custom events in VBA? Trying out Class, WithEvents, and RaiseEvent with minimal code

Observe a minimal event-driven setup where a custom event is declared in a VBA Class Module, raised with RaiseEvent, and handled with WithEvents.
2026.09.09
VBA / Office
PowerShell

Modifying environment variables in PowerShell and verifying with the GUI: The differences between Process, User, and Machine

Manipulate dummy environment variables at the Process and User scopes, and compare the Windows environment variable GUI with the PowerShell display.
2026.09.09
PowerShell
Programming / Web Development

Retrieving a smartphone's current location in the browser and displaying it on a map: Running the Geolocation API + Leaflet

Pass the latitude and longitude obtained via the Geolocation API to Leaflet to display the current position on the map. Observe the division of roles between location acquisition and map rendering.
2026.09.09
Programming / Web Development
Microsoft 365 / Azure

Are JWTs encrypted? — Reading the structure without real tokens in PowerShell

Create a complete dummy JWT-like dataset in PowerShell and safely observe header.payload.signature and Base64URL decoding.
2026.09.09
Microsoft 365 / Azure
Networking / RFC

Trying IPv6 Communication with PowerShell — How is the localhost TCP of ::1 Different from IPv4?

Set up a TCP server and client on a single PC using the IPv6 loopback ::1, and observe the differences in endpoints and AddressFamilies.
2026.09.09
Networking / RFC
PowerShell

Calling WinRT Directly from PowerShell: Observing Windows Power States with PowerManager

A minimal smoke test to call WinRT's PowerManager directly from Windows PowerShell 5.1 and read remaining battery capacity and power supply status.
2026.09.09
PowerShell
Linux / CLI / DevOps

Checking “Who is listening on this port?” in Ubuntu — Linking sockets and processes with ss

Learn how to check TCP listening ports and their associated processes in Ubuntu using ss. We also break down how to read 127.0.0.1, 0.0.0.0, and [::], and how permissions affect process displays.
2026.09.08
Linux / CLI / DevOps
Microsoft 365 / Azure

Where Do SPF, DKIM, and DMARC Apply? — Understanding All Three Through the Flow of a Single Email

We break down the roles of SPF, DKIM, and DMARC through the lifecycle of a single email. Based on the 2026 DMARC standard RFC 9989, we also review differences from the older RFC 7489.
2026.09.08
Microsoft 365 / Azure
VBA / Office

Dictionary is Convenient for Counting Duplicates in VBA — Aggregate Securely Without References

Use Scripting.Dictionary with Late Binding to aggregate duplicate values in column A. Output results to a dedicated sheet to prevent accidental deletion of input data.
2026.09.08
VBA / Office
Networking / RFC

In Which Layer Do HTTP 404, 502, and 504 Occur? — Troubleshooting from the Nginx and Application Request Path

Review the HTTP meanings of 404, 502, and 504 based on RFC 9110, and organize where to start investigating across Nginx and upstream applications along the request path.
2026.09.08
Networking / RFC
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