The registration database is a systemwide source of information about applications. This information is used to support the integration of applications with File Manager for Windows 3.1 and is used by applications that support object linking and embedding (OLE).
Your application can add entries to the registration database by using the registration functions; you can also add entries when you install your application by using Microsoft Windows Registration Editor (REGEDIT.EXE).
Following are the new registration database functions:
| Function | Description |
| RegCloseKey | Closes a key. |
| RegCreateKey | Creates a key. |
| RegDeleteKey | Deletes a key. |
| RegEnumKey | Enumerates subkeys of a specified key. |
| RegOpenKey | Opens a key. |
| RegQueryValue | Retrieves a text string for a specified key. |
| RegSetValue | Associates a text string with a specified key. |
The registration database feature depends on the dynamic-link library SHELL.DLL. This is a redistributable library.