Definition of ENDING in Files.f and use of |

In the Files.f file the definition of ENDING starts like this
| : ENDING ( addr len char -- addr len )
>R BEGIN 2DUP R@ SCAN

The word ending is used later in Files.f not available to me.
When I try to use | before a definition I get that | is not defined.

How and why is this uesd in the Files.f source?

Morten A. Steien

--
Bamsen
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