TTS services functions

• NWDisableTTS(3nw)

• NWEnableTTS(3nw)

• NWGetTTSStats(3nw)

• NWTTSAbortTransaction(3nw)

• NWTTSBeginTransaction(3nw)

• NWTTSEndTransaction(3nw)

• NWTTSGetConnectionThresholds(3nw)

• NWTTSGetControlFlags(3nw)

• NWTTSGetProcessThresholds(3nw)

• NWTTSIsAvailable(3nw)

• NWTTSSetConnectionThresholds(3nw)

• NWTTSSetControlFlags(3nw)

• NWTTSSetProcessThresholds(3nw)

• NWTTSTransactionStatus(3nw)