> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Supplementary Objects and Methods

This group consists of auxiliary objects. These objects are collections of different types and other objects which are used as input parameters and return values in ABBYY FineReader Engine methods. The methods that are common to many different objects (such as adding an element to the collection, or saving the persistent object to disk) are also described in this section.

This section contains descriptions of the following supplementary objects and interfaces:

* [StringsCollection](/fine-reader/engine/api-reference/supplementary-objects-and-methods/stringscollection)
* [IntsCollection](/fine-reader/engine/api-reference/supplementary-objects-and-methods/intscollection)
* [SplitRegions](/fine-reader/engine/api-reference/supplementary-objects-and-methods/splitregions)
* [SplitRegion](/fine-reader/engine/api-reference/supplementary-objects-and-methods/splitregion)
* [Region](/fine-reader/engine/api-reference/supplementary-objects-and-methods/region)
* [RegionsCollection](/fine-reader/engine/api-reference/supplementary-objects-and-methods/regionscollection)
* [FRRectangle](/fine-reader/engine/api-reference/supplementary-objects-and-methods/frrectangle)
* [Point](/fine-reader/engine/api-reference/supplementary-objects-and-methods/point)
* [Handle](/fine-reader/engine/api-reference/supplementary-objects-and-methods/handle)
* [IReadStream](/fine-reader/engine/api-reference/supplementary-objects-and-methods/ireadstream)
* [IWriteStream](/fine-reader/engine/api-reference/supplementary-objects-and-methods/iwritestream)
* [IFileWriter](/fine-reader/engine/api-reference/supplementary-objects-and-methods/ifilewriter)
* [IParallelProcessingCallback](/fine-reader/engine/api-reference/supplementary-objects-and-methods/iparallelprocessingcallback) (Linux and Windows)
* [IProcessingEvents](/fine-reader/engine/api-reference/supplementary-objects-and-methods/iprocessingevents)

The following methods and properties are implemented by many different objects:

* [Add](/fine-reader/engine/visual-components-reference/supplementary-objects/spellwordcollection/add-method)
* [AddNew](/fine-reader/engine/api-reference/supplementary-objects-and-methods/addnew-method)
* [CopyFrom](/fine-reader/engine/visual-components-reference/supplementary-objects/spellwordcollection/copyfrom-method)
* [DeleteAll](/fine-reader/engine/visual-components-reference/supplementary-objects/spellwordcollection/deleteall-method)
* [DeleteAt](/fine-reader/engine/visual-components-reference/supplementary-objects/spellwordcollection/deleteat-method)
* [Element](/fine-reader/engine/visual-components-reference/supplementary-objects/spellwordcollection/element-property)
* [Item](/fine-reader/engine/visual-components-reference/supplementary-objects/spellwordcollection/item-method)
* [LoadFromFile](/fine-reader/engine/api-reference/supplementary-objects-and-methods/loadfromfile-method)
* [LoadFromMemory](/fine-reader/engine/api-reference/supplementary-objects-and-methods/loadfrommemory-method) (Win)
* [SaveToFile](/fine-reader/engine/api-reference/supplementary-objects-and-methods/savetofile-method)
* [SaveToMemory](/fine-reader/engine/api-reference/supplementary-objects-and-methods/savetomemory-method) (Win)