# The Filter Process Model

By default, Filter runs independently from the calling application process. This is called out-of-process filtering. Out-of-process filtering protects the stability of the calling application in the rare case when a malformed document causes Filter to fail. You can configure Filter to run in the same process as the calling application. This is called in-process filtering. However, it is strongly recommended you run Filter out of process whenever possible.

To monitor and debug filtering operations during out-of-process filtering, you can generate an error log at run time. See Generate an Error Log.

The following methods run in process or out of process:

## Filter API

- CanFilter
- CanFilterEx
- DoFilter
- DoFilterChunk
- GetSummaryInfo
- GetDocFormatInfo
- GetXmpInfo

## File Extraction API

- ExtractCloseDocument
- ExtractGetSubFileInfo
- ExtractGetSubFileMetadata
- ExtractSubFile
- ExtractGetMainFileInfo
- ExtractOpenDocument
- GetSummaryInfo

Other Filter API methods always run in process.

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