Editing High Level Architecture (section)

===Federation Management Services===
The purpose of Federation Management services, described in chapter 4 of the HLA Interface Specification,<ref name="IFSPEC" /> is to manage Federation Executions as well as federation-wide operations such as Synchronization Points and Save/Restore.

One set of Federation Management services manages the connection to the RTI, the federation execution and the set of joined federates. Key services are:

* Connect and Disconnect from the RTI
* CreateFederationExecution and DestroyFederationExecution that are used to create and destroy a federation execution
* JoinFederationExecution and ResignFederationExecution that are used by a federate to join and resign a federation execution.
* ConnectionLost, that is used by the RTI to inform a federate that it has lost its connection to the federation execution due to a fault
* ListFederationExecutions that is used to retrieve a list of available federation executions for an RTI

Another set of services relates to synchronization points. These are federation-wide events where all, or selected federates are required to complete an operation, such as initializing a scenario, before the execution can continue. Key services are:

* RegisterFederationSynchronizationPoint that is used to register a synchronization point 
* AnnounceSynchronizationPoint that is used by the RTI to inform federates that a synchronization point has been registered
* SynchronizationPointAchieved that is used by a federate to indicate that it has achieved a synchronization point
* FederationSynchronized that is used by the RTI to Inform federates that the federation is synchronized, i.e. all federates have achieved the synchronization point.

Yet another set of service relates to saving and restoring a federation execution. A save operation requires both the RTI and each federate to perform a save of their internal state. A restore operation requires both the RTI and each federate to perform a restore of their internal state. Key services are:

Save:
* RequestFederationSave that is used to initiate a save of a federation
* InitiateFederateSave that is used by the RTI to notify federates to start saving its state
* FederateSaveComplete that shall be called by a federate when it has completed saving its state.
* FederationSaved that is used by the RTI to notify federates that the federation is saved

Restore:
* RequestFederationRestore that is used to initiate a restore of a federation
* InitiateFederateRestore that is used by the RTI to notify federates to start restoring its state
* FederateRestoreComplete that shall be called by a federate when it has completed restoring its state.
* FederationRestored that is used by the RTI to notify federates that the federation is restored