Testing PHP Files with PHP built-in Web Server

In a previous post, we described how to run PHP scripts from a local copy of IIS. This time we…

The Good, the Bad, and the Ugly of the whoami (“Who Am I”) command

Don’t be fooled by the apparently ridiculous name of this command. If you are in a shared environment, have administrative…

Repairing Protected System Files with SFC

System Files Checker (SFC) is a tool that can be run under Command Prompt (CMD). The tool scans the integrity…

Repairing corrupted files with Command Prompt CHKDSK tool

Repairing corrupted files in Windows computers can be done with the Command Prompt check disk tool (CHKDSK). Using Command Prompt…

Creating or undoing system restore points in Windows 11

Creating or undoing system restore points in Windows 11 To create a restore point: To undo a restore point:

Installing PHP locally on a Windows 11 Internet Information Services (IIS) Environment

This tutorial applies to installations on a local computer with Windows 11, which comes with Internet Information Services (IIS). The…

Missing IIS after reinstalling Windows 11?

An old post describes how to install IIS on Windows 11 . After a Windows reinstall, however, you may need…

SATOR Square: An unsolved puzzle?

Oldie, but goodie: The SATOR square, SATORAREPOTENETOPERAROTAS This is one the most well-known unsolved word puzzles, with a history of…

Ratio of averages or average of ratios?

Should we report a ratio of averages (RA) or an average of ratios (AR)? The answer depends on what we…

Having Fun with Eigenvalues

If A is a 3×3 matrix with eigenvalues 2, 3, 5, and B is its inverse matrix. Then: Trace of…