How can you alter core features with a custom module?

[goldleader]

I would like to create a module which would add some extra functions when a new page is made. So I would like to make the module add a checkbox to the page edit form which would run a bit of my own code when submit or apply is pressed. But I don't know where to start.

I searched all over but couldn't find anything besides a bit in the faq about modifying language files with modules but it was a bit implicit.

I don't want to alter the hard code directly as it would become an issue when the site needed updating.

Any help would be appreciated.

[Nullig]

You could use the AdvancedContent module to add a checkbox, and then use the Event Manager to run your code (UDT), if the proper entry is in the block.

Nullig

[tomgsd]

You could also register an additional content type like the ones in the Cataloger module..