Channels and processes etc. are first class values, so they can be computed, passed as parameters, and passed down channels, of course.

In the following artificial example

outputB is an action to output 'B' on a fixed channel, here stdOp,

outputX uses a fixed channel, stdOp again, but is parameterised on the value, X,

inputX is an input action.

procE is a process.

The sender process gives these actions and process to the receiver process which makes use of them.