I believe it's usually done (I've not had to do it) so that you can force some small set of data to always be in ram. This way even in the case of someone mana

I believe it's usually done (I've not had to do it) so that you can force some small set of data to always be in ram. This way even in the case of someone managing to cause something to leak memory the code will always be in ram. Whether this is really needed or not I can't say.