//on the client side, my sync agent
public partial class LocalCPICacheSyncAgent  
    {
        
        partial void OnInitialized()
        {
            this.Configuration.SyncParameters.Add(new Microsoft.Synchronization.Data.SyncParameter("@ClientId", MyClient.ClientId));
        }
    }

//on the server side, my sync provider
public partial class LocalCPICacheServerSyncProvider {

        partial void OnInitialized()
        {
            this._ranksSyncAdapter.SelectIncrementalInsertsCommand.CommandText =
                this._ranksSyncAdapter.SelectIncrementalInsertsCommand.CommandText + " AND ClientId = @ClientId";

            this._ranksSyncAdapter.SelectIncrementalInsertsCommand.Parameters.Add(new System.Data.SqlClient.SqlParameter("@ClientId", System.Data.SqlDbType.Int));

            this._ranksSyncAdapter.SelectIncrementalUpdatesCommand.CommandText =
                this._ranksSyncAdapter.SelectIncrementalUpdatesCommand.CommandText + " AND ClientId = @ClientId";

            this._ranksSyncAdapter.SelectIncrementalUpdatesCommand.Parameters.Add(new System.Data.SqlClient.SqlParameter("@ClientId", System.Data.SqlDbType.Int));
        }
    }