This function enumerates the list of clipboard data formats available in the clipboard.

#define INCL_WINCLIPBOARD /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>

HAB      hab;     /*  Anchor-block handle. */
ULONG    fmt;     /*  Previous clipboard-data format index. */
ULONG    ulNext;  /*  Next clipboard-data format index. */

ulNext = WinEnumClipbrdFmts(hab, fmt);