Transfers "octets", bytes of data using read and write.

Transfers datagrams to hosts designated by the datagram.

Transfers "sockets", file descriptors (listen/accept) for accepting connection.

Transfers file descriptors (libancillary for python). However, it is not functioning.

Transfers Transits that have events ready for processing (I/O).

(capital j) refers to the Array instance.

(lowercase t) refers to an arbitrary Channel instance.

(lowercase o) refers to an arbitrary Octets instance.

(capital S) refers to an arbitrary Sockets instance.

(lowercase p) refers to an arbitrary Port instance.

(capital P) refers to an arbitrary Ports (plural) instance.

(capital d) refers to an arbitrary Datagrams instance.

Refers to Event QUALificationS These are state flags that must be present in order for a particular event to occur.

refers to the direction of flow wrt process perspective

refers to setting a flag on 'equals'

refers to clearing a flag on 'equals'

refers to testing for the presence of a flag on 'equals'

refers to external event qualifications (kernel)

refers to internal event qualifications (process)

are control flags for signalling events listens, requeue, forced transfers.