[TYPO3] referencing graphicsmagick in php

[dave typo]

do i code referencing imagemagick, when using graphicsmagick? does
typo3 use imagemagick code lines to call graphicsmagick?

for example
$GLOBALS['TYPO3_CONF_VARS']['GFX']


automatically knows what im using right?


and

t3lib_div.imageMagickCommand


also will use graphicsmagick right?

or is there another under t3lib_div ??

I can't see it.

-dave