Registers the two surfaces as receivers in the ambient realm, creating a
push stream for each that has none, asking for every CAEP, RISC and SSF
event type. An existing stream is left as it is.
Returns number
the number of streams created; 0 when the receivers are off
Registers the two surfaces as receivers in the ambient realm, creating a push stream for each that has none, asking for every CAEP, RISC and SSF event type. An existing stream is left as it is.