The APEX application does not use rollover/drop-down menus. Instead it uses tabs that, when clicked, display a page containing buttons for specific functions. Clicking the button will launch the appropriate web page.
Links to other applications or web pages are in the top right corner.
Some pages will contain a CANCEL button that will take you back to the previous page.
There is also a breadcrumb trail at the bottom of a page that shows how you got to the current page. You can click on the breadcrumb link to return to a prior page.