What do the filled corners on top of the buttons mean?

The filled-in corners were added in Proloquo2Go 4.0. They mean that if you hold or double-tap a button, something different will happen than if you just tap it normally. 

The hold or double-tap is called the "secondary trigger." The user can choose whether to use a hold or a double tap as the secondary trigger, and can adjust the required hold time or speed of the double-tap. To do this, go to Options > Interaction. Under Buttons, tap Secondary Trigger. You can turn off the secondary trigger by selecting None.

What will happen when the button is held or double tapped? That depends on the button. For many buttons, the secondary trigger activates a grammar support popup. Proloquo2Go's grammar support popups give access to different forms of nouns, verbs, adjectives, and pronouns. When the Grammar Support feature is enabled, these popups will appear when one of the supported word kinds is selected and Inflect is set to ON for the button. 

You can enable Grammar Support for all word kinds, only some, or for specific inflections. It is also possible to disable it entirely. For more information, see Grammar popups in the Proloquo2Go Manual. From there, you can click to go to the next page and continue learning more about Grammar Support. If you or the user you support cannot perform the secondary trigger action, you can make popups open automatically. To do this, go to Options > Interaction. Under Buttons, toggle Auto-Open Popups to ON.

Other buttons perform a different action when the secondary trigger is activated. In the Crescendo™ vocabulary, some buttons will open a popup with more choices based on the original word.  For example, when you activate the secondary trigger on the "some" button in the Intermediate and Advanced Core vocabularies, a popup opens with the words "some," "somebody," "something," and "somewhere."

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