How can I write my own program to display my computer's information?

I’m thinking of Belarc Advisor link .
Is that what you want?

Here is a list of free programs that provide system information:

link

This might work for you. Here are screenshots.

Something similar on a Mac is GeekTool

I believe Rainmeter is exactly what you are looking for. It is very similar to Samaurize, but has a larger community with many more customizations.

Lifehacker also has many, many articles on it that can give you help and inspiration.

Also pretty kinda cool is BgInfo from Microsoft (nee Sysinternals).

You can configure it to update your current desktop wallpaper with text describing your system in its current state. It can display dozens of items, including: hostname, domain, OS version, DNS servers, IP address, available memory, available disk, and much more.

Really great if you access several machines from a single desktop/screen.

If you want to make your own programs for windows, Visual Basic would be a good language to start with. I recommend starting with VB 6 rather than the newest versions (.NET) just for simplicity.

Well if you want all that stuff, you can’t do it in a webpage but you can do it with a VBscript. I havent seen a program show running processes though. To display a PCs info I like to use http://www.gtopala.com/siw-download.html because it has a standalone exe that just runs so theres nothing to install. It shows you all your hardware and a bunch of information. You can try it out in a second and delete it if you don’t want it.