How to print out a contemplate content?

Hi,

I need to put out a php-contemplate content.

It works well as normal node output, but I need now to render a node programmatically.

My node has a void body, but a lot of php code into 'Affect body output' section.
If I try with "node_load($nid)" and "print $node->body", it doesnt' work (as expected).

How can I render contemplate 'affect body output' code? Which php snippet code do I need?

Thanks!