This points to a string that contains a list of help window library names
that will be searched by the Help Manager for the requested help window.
The names must be separated by a blank.
ulReserved (ULONG)
Reserved value, should
be 0.
rc (ULONG)
Return code.
The newly specified library successfully replaced
the current help window library name. Other
See
the values of the ulErrorCode parameter of the HM_ERROR
message.