What function does the MaxStream fulfill in MAC mode?

What function does the MaxStream fulfill in MAC mode? For example when MM is 0 = 802.15.4 + MaxStream header w / ACKS.

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Here:
https://www.digi.com/resources/documentation/Digidocs/90001500/Reference/r_cmd_MM.htm?tocpath=AT%20commands|Networking%20and%20security%20commands|_____9

And here:
https://stackoverflow.com/a/72821797/3272028