> ## Documentation Index > Fetch the complete documentation index at: https://docs.therootnetwork.com/llms.txt > Use this file to discover all available pages before exploring further. # Session ## Calls ### purgeKeys Removes any session key(s) of the function caller. This doesn't take effect until the next session. The dispatch origin of this function must be Signed and the account must be either be convertible to a validator ID using the chain's typical addressing system (this usually means being a controller account) or directly convertible into a validator ID (which usually means being a stash account). **Namespace** ``` api.tx.session.purgeKeys ``` **Type** ``` function purgeKeys( ) ``` ### setKeys Sets the session key(s) of the function caller to `keys`. Allows an account to set its session key prior to becoming a validator. This doesn't take effect until the next session. The dispatch origin of this function must be signed. **Namespace** ``` api.tx.session.setKeys ``` **Type** ``` function setKeys( keys: SeedRuntimeSessionKeys, proof: Bytes ) ``` ## Storage ### currentIndex Current index of the session. **Namespace** ``` api.query.session.currentIndex ``` **Type** ``` function currentIndex( ): u32 ``` ### disabledValidators Indices of disabled validators. The vec is always kept sorted so that we can find whether a given validator is disabled using binary search. It gets cleared when `on_session_ending` returns a new set of identities. **Namespace** ``` api.query.session.disabledValidators ``` **Type** ``` function disabledValidators( ): Vec ``` ### keyOwner The owner of a key. The key is the `KeyTypeId` + the encoded key. **Namespace** ``` api.query.session.keyOwner ``` **Type** ``` function keyOwner( (SpCoreCryptoKeyTypeId,Bytes) ): Option ``` ### nextKeys The next session keys for a validator. **Namespace** ``` api.query.session.nextKeys ``` **Type** ``` function nextKeys( SeedPrimitivesSignatureAccountId20 ): Option ``` ### queuedChanged True if the underlying economic identities or weighting behind the validators has changed in the queued validator set. **Namespace** ``` api.query.session.queuedChanged ``` **Type** ``` function queuedChanged( ): bool ``` ### queuedKeys The queued keys for the next session. When the next session begins, these keys will be used to determine the validator's session keys. **Namespace** ``` api.query.session.queuedKeys ``` **Type** ``` function queuedKeys( ): Vec<(SeedPrimitivesSignatureAccountId20,SeedRuntimeSessionKeys)> ``` ### validators The current set of validators. **Namespace** ``` api.query.session.validators ``` **Type** ``` function validators( ): Vec ``` ## Events ### NewSession New session has happened. Note that the argument is the session index, not the block number as the type might suggest. **Namespace** ``` api.events.session.NewSession ``` **Type** ``` type NewSession = { session_index: u32 } ``` ## Errors ### DuplicatedKey Registered duplicate key. **Namespace** ``` api.errors.session.DuplicatedKey ``` ### InvalidProof Invalid ownership proof. **Namespace** ``` api.errors.session.InvalidProof ``` ### NoAccount Key setting account is not live, so it's impossible to associate keys. **Namespace** ``` api.errors.session.NoAccount ``` ### NoAssociatedValidatorId No associated validator ID for account. **Namespace** ``` api.errors.session.NoAssociatedValidatorId ``` ### NoKeys No keys are associated with this account. **Namespace** ``` api.errors.session.NoKeys ``` undefined