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(mozilla-projects-nss-reference-fc-opensession)=
# FC_OpenSession
## [Name](#name)
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FC_OpenSession - open a session between an application and a token.
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## [Syntax](#syntax)
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```{code}
CK_RV FC_OpenSession(
CK_SLOT_ID slotID,
CK_FLAGS flags,
CK_VOID_PTR pApplication,
CK_NOTIFY Notify,
CK_SESSION_HANDLE_PTR phSession
);
```
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## [Parameters](#parameters)
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`FC_OpenSession` has the following parameters:
`slotID`
: [in] the ID of the token's slot.
`flags`
: [in]
`pApplication`
`Notify`
: [in] pointer to a notification callback function. Not currently supported.
`phSession`
: [out] pointer to a session handle.
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## [Description](#description)
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`FC_OpenSession` opens a session between an application and the token in the slot with the ID
`slotID`.
The NSS cryptographic module currently doesn't call the surrender callback function `Notify`.
(See PKCS #11 v2.20 section 11.17.1.)
A user may call `FC_OpenSession` without logging into the token (to assume the NSS User role).
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## [Return value](#return_value)
## [Examples](#examples)
## [See also](#see_also)
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- {ref}`mozilla_projects_nss_reference_fc_closesession`,
[NSC_OpenSession](/en-US/NSC_OpenSession)
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