The GlideUser API class in ServiceNow provides methods that allow you to get information about the current user, their roles and permissions, and their preferences; all without needing to rely on much slower GlideRecord queries.
The GlideUser class has no constructor method, and instead it is generally declared by calling the GlideSystem method: gs.getUser(), which returns the GlideUser object.
The getPreference() method of the GlideUser class allows you to retrieve the value of one of the user's user preferences. User preferences are stored within the sys_user_preference table, and consist of things like how many records to display per page in a given list, or what update set is currently selected.
This method accepts one argument: a string containing the name of the preference to retrieve.
The getPreference() method returns a string containing the value of the preference requested, or null if no such preference is defined.
savePreference() on the...