This function deletes an atom from an atom table.

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

HATOMTBL    hatomtblAtomTbl;  /*  Atom-table handle. */
ATOM        atom;             /*  Atom identifying the atom to be deleted. */
ATOM        rc;               /*  Return code. */

rc = WinDeleteAtom(hatomtblAtomTbl, atom);