Harakiri asked me a while ago to have he’s TRK news headlines on top of the start page of the TRK project. Since content is HTML coming from db and parsed into template it could not easy be done via php.
With the new feature you can execute custom functions and php functions in your content.

For example the news headlines from TRK:
I created a include file (that auto includes into cms) with a function called ‘show_headlines_trk()’ where the headlines are queried from db and output to HTML content.

This function is called in the HTML source like this (and can be placed anywhere):
Stars are placed to prevent execution in the example:

[exe*=show_headlines_trk][/*exe]

Outputs:

[exe=show_headlines_trk][/exe]

Or another example using standard php function:

[exe*=date]Y-m-d H:i:s[/*exe]

Outputs:

[exe=date]Y-m-d H:i:s[/exe]

This works in content pages, News pages or blocks. The only thing you have to do is enable the "Processor On" feature (for pages it is in advanced edit).