H - Common H Interface

Hclose/hclose	Closes the access path to the file.
Hgetfileversion/hgfilver	Retrieves version information for an HDF file.
Hgetlibversion/hglibver	Retrieves the version information of the current HDF library.
Hishdf	Determines if a file is an HDF file.
Hopen/hopen	Provides an access path to an HDF file by reading all the data descriptor blocks into memory.
HDdont_atexit/hddontatexit	Indicates to the library that an 'atexit()' routine is _not_ to be installed.
HEprint/heprnt	Prints information to the error stack.
HEstring	Returns the error message associated with specified error code.
HXsetcreatedir/hxiscdir	Initializes the directory environment variable, identifying the location of the external file to be written.
HXsetdir/hxisdir	Initializes the directory environment variable, identifying the location of the external file to be located.