# HDF Reference Manual

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> ### H - H Advanced Interface

> | Happendable | Specifies that the specified element can be appended to
> | Hcache | Enables low-level caching for the specified file.
> | Hdeldd | Deletes a tag and reference number from the data descriptor list.
> | Hendaccess | Terminates access to a data object by disposing of the access identifier.
> | Hendbitaccess | Disposes of the specified bit-access file element.
> | Hexist | Locates an object in an HDF file.
> | Hfidinquire | Returns file information through a reference of its file identifier.
> | Hfind | Locates the next object to be searched for in an HDF file.
> | Hgetbit | Reads one bit from the specified bit-access element.
> | Hgetelement | Reads the data element for the specified tag and reference number and writes it to the data buffer.
> | Hinquire | Returns access information about a data element.
> | Hlength | Returns the length of a data object specified by the tag and reference number.
> | Hnewref | Returns a reference number that can be used with any tag to produce a unique tag /reference number pair.
> | Hnextread | Searches for the next data descriptor that matches the specified tag and reference number.
> | Hnumber/hnumber | Returns the number of instances of a tag in a file.
> | Hoffset | Returns the offset of a data element in the file.
> | Hputbit | Writes one bit to the specified bit-access element.
> | Hputelement | Writes a data element or replaces an existing data element in a HDF file.
> | Hread | Reads the next segment in a data element.
> | Hseek | Sets the access pointer to an offset within a data element.
> | Hsetlength | Specifies the length of a new HDF element.
> | Hshutdown | Deallocates buffers previously allocated in other H routines.
> | Htagnewref | Returns a reference number that is unique for the specified file that will correspond to the specified tag. Creates a new tag/reference number pair.
> | Htrunc | Truncates the data object specified by the h_id to the length trunc_len.
> | Hwrite | Writes the next data segment to a specified data element.

> ###

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