System services interface functions access code and data in modules, allocate and manage both local and global memory, manage tasks, load program resources, translate strings from one character set to another, alter the Windows initialization file, assist in system debugging, carry out communications through the system's I/O ports, create and open files, and create sounds using the system's sound generator. For more information on topics related to system services interface functions, see the following:
| Topic | Reference |
| Function descriptions | Windows Programming Reference: Chapter 4, “Functions Directory” |
| Windows data types and structures | Windows Programming Reference: Chapter 7, “Data Types and Structures” |