Accessing Admin page handles

A question for you more knowledgeable in creating plugins:

I’m creating a plugin with multiple admin subpages. I want to be able to access the $handle or $menu_bug of that particular page. To further explain, when using the add_menu_page function as so:
add_menu_page(page_title, menu_title, capability, handle, [function], [icon_url]);

I want to be able to access what is stored as the handle in the code of that admin menu page. I’ve been searching all morning and haven’t found anything concrete. Thanks in advance for your help.