[Muscle] What's the intent of PC_to_RDR_T0APDU in ccid specification

[zeal]

Hi list,

I've a question about CCID specification. Can I ask here? If not, sorry
and just ignore me.

The command PC_to_RDR_T0APDU in that confuses me. What's the effect? Why
I need use a new class byte?

Any hint is appreciated.

Thanks.

--
zeal