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//create locator and annotation
         spaceLocator -p 0 0 0 -n "myAnnotatedLocator";
         createAnnotation "Y Value is 0";

//get annotation details
         select -r "myAnnotatedLocator";
         PickWalkDown;PickWalkRight;PickWalkDown;PickWalkRight;
         global string $annoName[];
         $annoName = `ls -sl`;

//start scriptjob to update annotation on locator height change
         int $annoUpdate = `scriptJob -ac myAnnotatedLocator.ty "annoUpdateProc"`;

//reselect locator
         select -r "myAnnotatedLocator";

////////////////////////////////////////////////////////////////////////////////////

//proc to update annotation

global proc annoUpdateProc()
{
global string $annoName[];

//delete old nodes
         delete $annoName[0];
         select -r myAnnotatedLocator;
         PickWalkDown;
         PickWalkRight;
         doDelete;

//get locator height
         float $locatorHeight = `getAttr myAnnotatedLocator.ty`;
         
//create new annotation
         select -r myAnnotatedLocator;
         string $annotationLabel = ("Y Value is " + $locatorHeight);
         createAnnotation $annotationLabel;
         
//reselect locator
         select -r myAnnotatedLocator;
}