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Without getting into specifics, for there are many many blog publishing tools available, most blog publishing tools work in the same basic way.
They provide a way for you to post by using a template. That template is usually a standard HTML page, which a section of template tags which the blogging tool will use and replace with your content every time you publish a new post. So in your template you'll have tags in your template that represent the title of your post and the content of your post (&POSTTITLE& and &POSTCONTENT& for example). Your blogging tool knows to replace those tags with what you type in the post title area, and the post content area.
From that basic idea you can extend the use of tags to automatically add in the time and date the post was made, the name of the person who posted, and so on.
HaloScan uses these tags as well, as they can provide a unique way of identifying a post, to provide a unique comment identifier.
How Blogging Tools Work
Without getting into specifics, for there are many many blog publishing tools available, most blog publishing tools work in the same basic way.
They provide a way for you to post by using a template. That template is usually a standard HTML page, which a section of template tags which the blogging tool will use and replace with your content every time you publish a new post. So in your template you'll have tags in your template that represent the title of your post and the content of your post (&POSTTITLE& and &POSTCONTENT& for example). Your blogging tool knows to replace those tags with what you type in the post title area, and the post content area.
From that basic idea you can extend the use of tags to automatically add in the time and date the post was made, the name of the person who posted, and so on.
HaloScan uses these tags as well, as they can provide a unique way of identifying a post, to provide a unique comment identifier.