Here is a list of some, hopefully, helpful notes of a variety of different items

DNS Information If you are wanting to know what to put into your DNS records, this give an overview of the information required.
FavIcons How to set up a FavIcon on your web site (That is the little icon that is displayed next to the address of your URL at the top of the browser)
HTTP Cookies How to work with Cookies
HTTP Status Codes List of Codes that you could get back from your HTTP server each time someone requests a file.
Macintosh Startup Keys This list of special key combinations has been compiled for your information. Most of them are useful for when you start up your Macintosh computer.
Maxnet backup error What to do when you have the error telling you that you can continue with you backup because there is already one running.
php Links It's sometimes helpful to get the php code from someone else, and the tweak it for your own use,  this is a list of links to sites that provide such code.
Print to PDF Here is an overview of some programs that will do your PDFing automatically for free.
Print to PDF DOS Here is a set of instructions to help you create PDF files from within any windows program that you want to create PDF files from.
Remove SMB2 Instructions on how to remove SMB2 from Windows
Server Side Include [SSI] Commands This is a list of the commands that you can use if you have a SSI Server running for your web page.
Speed Test Here is a page that will test the speed of your Internet connection.
Windows Keys A list of key combinations using the Windows key on your keyboard.
Windows on Macintosh A List of Applications that will give you the ability to run Window's program on a Macintosh.

Tech Notes for a SmE Server

eMail Lists How to maintain your Whitelist and Black list for the spam assassin
MySQL on SmE What I had to do to get MySQL working on my SmE Server.
Open Port 3306 Instructions on how to open port 3306 for MySQL on a SME computer
Reset ClamAV
 Reset the ClamAV database