Keyboard Maestro includes permanently stored dictionaries that you can use or set.
A dictionary is a mapping from a key name to a value. You can have multiple dictionaries, each with their own name (so really, it is a mapping from a dictionary name and a key name to a value).
Dictionary names start with a alphabetic character, followed by any number of alphanumeric, space or underscores. Dictionary names are case insensitive.
Key names can be anything, although leading and trailing white space is stripped off. Key names are case insensitive.
Dictionary values are plain text and can include leading or trailing white space.
Use the Set Dictionary Value action to set a dictionary value.
You can use the %Dictionary% token to access Dictionary values.