This function is identical to the WinAddAtom function, except that:

• If the atom name is not found in the table, it is not added to the table and 0 is returned.
  
• If the atom name is found in the table, the use count is not incremented.

Because integer atoms do not have a use count and do not actually occupy memory in the atom table, this function is identical to WinAddAtom with respect to integer atoms.