SetTabIndex

struct swf_settabindex {
	swf_tag			f_tag;		/* 66 */
	unsigned short		f_depth;
	unsigned short		f_tab_index;
};

This tag defines the tab index of any text object (static and dynamic text objects.)

The depth references the object which is assigned the tab index. The tab index defines the order in which objects are sorted to know where to go next when the tab key is pressed.