Indicates that the current message contains application data.
The structure of the M_PROTO message block, if present, is as follows:
typedef struct { ulong PRIM_type; ulong DATA_xfer_flags; } N_data_ind_t;
Otherwise, the message consists of one or more M_DATA message blocks.
The N_DATA_IND primitive indicates to the NS user that this message contains NS user data. This primitive originates from the network provider and is a response to the N_DATA_REQ primitive. The network service data unit (NSDU) can be segmented into more than one network interface data units (NIDUs). The MORE_DATA_FLAG associates NIDUs with the NSDU. The RC_FLAG flag can be set only on the last NIDU.
The format of the message is one or more M_DATA message blocks. The value of the NS user data field is always the same as that supplied in the corresponding N_DATA_REQ primitive at the peer service access point. M_PROTO message blocks are optional.
The N_DATA_IND primitive is part of X.25 Licensed Program.