Application Context An Application Context is activated when the selected application is running in the foreground and deactivated otherwise.

The button in the bottom right indicates whether the context is inverted or not. If the button is lit-up, this context will become active when any application apart from the selected one is launched.

Application Checking

When any profiles have application contexts specified, Tasker checks frequently to see if one of those applications has been launched. The default is every 500ms.

If you would like quicker response, or you suspect this is increasing your battery drainage, you can change this value in the settings screen (select Menu->Preferences from the Profile List screen).