Example at http://androidfact.com/what-happened-to-the-samsung-galaxy-s5-menu-button/
This means that apps like twicca need to test on the models noted and put out some errata note about how it changes when you have this or that Android.
--> This is also why Android is a bit of trouble. Letting the makers tinker with basics means that you can't expect apps, buttons and keys to do the same thing across machines.
The J5 'recents key' is the key I use to access nearly every single function on my twicca app. Or it was on my old samsung. On the J5 the recents key minimises the app. I have been trying for hours to find another way to access the functions of twicca without using this key (everything from profile, search, block, list, search, settings and much much more) using the new samsung but haven't found anything. Samsung J5 people PLEASE PLEASE help me, I live on twicca all day every day, I can't live without it.