Understanding the TCP flow and congestion control through an example

Tags:
computer networks
TCP
I am trying to understand the TCP flow and congestion control mechanisms  
The example that I am following has these parameters

- Assume that the Initial Sequence Number (ISN) for TCP A is 100 and
the ISN for TCP B is 600  
- Both window sizes are fixed at 2048 bytes.The Maximum Segment Size (MSS) is 536 bytes
- the initial congestion window size is 1 MSS

The transaction takes places in the following sequence:  
1. A establishes connection with B  
2. A sends 30 byte data to B  
3. B reads the data and sends 3000 byte data to A

The protocol explanation goes like:  
1. A -> B: SYN=1 Seq no=100  
2. B -> A: SYN=1, ACK=1, Seq no=600, Ackn no=101, Window Size=2048  
3. A -> B: ACK=1, Seq no=101, Ackn no=601, Window Size=2048   
4. ...(it will continue)

Can anyone explain what is the relevance of the congestion window size of 1 MSS here?

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