[Andreas]

Well ... datastore is nothing mysterious.

The table holds serialized content of variables (mostly arrays).

If you want to read one of those you must include the key in $specialtemplates, init.php will then load the according rows from the table into $datastore
To get your stuff use $myarray = unserialize($datastore['mykey']);
To write your stuff call build_datastore('mykey', serialize($myarray)), this function is defined in functions_databuild.php.

That's it.