hatomtblAtomTbl (HATOMTBL) - input
This is the handle returned from a previous WinCreateAtomTable or WinQuerySystemAtomTable function.
pszAtomName (PSZ) - input
This is a null terminated character string to be found in the table.
If the string begins with a "#" character, the five ASCII digits that follow are converted into an integer atom.
If the string begins with a "!" character, the next two bytes are interpreted as an atom.
If the high order word of the string is -1, the low order word is an atom.
atom (ATOM) - returns
Atom