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How many TCP frames can be unacknowledged at the same time?

TCPNet is supposed to use buffering which allows for faster data transmission rates.
I see however that in some example programs/documentation, the handler of the TCP_STATE_CONNECT state in the send function checks if the previous frame (<1460 bytes) was acknowledged by the peer (by "tcp_check_send"). The question is: if my heap is large enough, can I send out large amounts of data that would later be acknowledged or do I need to wait for the acknowledgement of the large send frame?

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