There are three categories of libraries used in IntelliComplete. Language library and professional library are both word libraries which are used for autocompletion. There are no difference between language libraries and professional libraries in structure. They only differ in content. Language libraries contain the general vocabulary of western languages like English, German, French and Spanish. Professional libraries mainly consist of words dealing with a special profession or topic. Shorthand libraries store shorthands and their full text. They are used for autoexpansion.
All language libraries are stored in InstallDir\langlib. All professional libraries are stored in InstallDir\proflib. All shorthand libraries are stored in InstallDir\shlib. InstallDir is the installation directory of IntelliComplete. Please note that a library will not be displayed in the 'Set Active Library' dialog unless you have put it under the proper directory.
You can set active libraries by selecting 'Library Management->Set Active Libraries...' from the main menu. Only active libraries will be retrieved by IntelliComplete for matching words, phrases or shorthands. Click at any library entry to toggle its status.