I have searched but I could not find the following:  

Process1 transmits data over TCP socket. The code that does the transmission is (pseudocode) 

```
//Section 1
write(sock,data,len);//any language.Just write data
//Section 2

```

Process1 after the write could continue in section 2, but this does not mean that data has been transmitted. TCP could have buffered the data for later transmission.  

Now Process2 is running concurrently with Process1. Both processes try to send data **concurrently**. I.e. both will have code as above.  

**Question1:** If both processes write data to TCP socket **simultaneously** how will the data be eventually transmitted over the wire by IP/OS?  

a) All data of Process1 followed by all data of Process2 (or reverse) i.e. some FIFO order?  

or  

b) Data from Process1 & Process2 would be multiplexed by IP layer (or OS) over the wire and would be send "concurrently"?  

**Question2:** If e.g. I added a delay, would I be sure that data from the 2 processes were send serially over the wire (e.g. all data of Process1 followed by all data of Process2)?  

**UPDATE:**  

Process1 and Process2 are not parent child. Also they are working on different sockets  

Thanks