Normally with:

1. a dedicated supplied remote control
2. a wireless remote device like an iPad, iPhone, iPod Touch
3. a laptop/PC/MAC.

A normal CD player is a self contained device with it's own remote control (normally line of sight Infra-Red). A streamer/player can also have it's own remote control - plus because the music is often streamed over a home wired or wireless network - it can additionally be controlled by any device able to connect to that network.

And because streaming can deal with multiple packets of digital data then more than one piece of music can be streamed simultaneously to different/multiple players and control devices.