Let MULTC be the multiplexor creator.

MULTC(0;SB,M ==> c;MULT,BSP) "Create Multiplexor"

BSP is a byte stream producer that is associated with the multiplexor.

c is zero if successful, loose end otherwise.

MULT(0; ==> c,(4,mbid);MB) "Create branch"

MB is a branch of multiplexor MULT and mbid is its unique identifier. {It is useful in (emcmb).}

C is zero if successful, 1 if no more branches are available. In the current implementation, 255 branches are available.

MULT(kt; ==> x'138';)

MB(order code,(ldata,data); ==> c;) "Send data"

Sends the following on the BSP associated with the branch's multiplexor, in order and contiguously:
.(4,ldata+8)

.(4,mbid)

.(4,order code)

.(ldata,data)

.(4,ldata+8)

C is x'238' {the alleged type}.

Design note: the length of the data is sent at the end as well as the beginning to facilitate searching backwards through the byte stream.