This API service or structure is not documented by official
Microsoft sources. Something may be undocumented for any
of several reasons:
■ It is dangerous; you could lose data.
■ It may change in future versions of DOS.
■ It has no particular value; there are other ways...
In most cases, information contained in TECH Help! has been
gleaned from official Microsoft sources, such as a
Microsoft Knowledge Base on Compuserve or in trusted
publications such as Microsoft Systems Journal. Some
information was obtained through trial-and-error testing.
In general, it's best to avoid using undocumented features.