[Android Head-Units] KoTiX2:
I've seen that it run all the services needed to run the winca applications like bluetooth, tv, aux, mpeg, channel manager(don't know what it is), etc.. and stopping this services the related application don't run as usual.

This is a list of the services started by the wincaService.apk:

<service android:name=".StartService">
<intent-filter>
<action android:name="com.winca.service.StartService" />
</intent-filter>
</service>
<service android:name="com.winca.service.bluetooth.BluetoothService" android:persistent="true" android:exported="true">
<intent-filter>
<action android:name="com.winca.service.bluetooth.IBluetoothInterface" />
</intent-filter>
</service>
<service android:name="com.winca.service.channelmanager.ChannelManagerService" android:persistent="true" android:exported="true">
<intent-filter>
<action android:name="com.winca.service.channelmanager.IChannelManagerInterface" />
</intent-filter>
</service>
<service android:name="com.winca.service.mpeg.MpegPlayerService" android:persistent="true" android:exported="true">
<intent-filter>
<action android:name="com.winca.service.mpeg.IMpegPlayerInterface" />
</intent-filter>
</service>
<service android:name="com.winca.service.radio.RadioPlayerService" android:persistent="true" android:exported="true">
<intent-filter>
<action android:name="com.winca.service.radio.IRadioInterface" />
</intent-filter>
</service>
<service android:name="com.winca.service.tv.TVService" android:persistent="true" android:exported="true">
<intent-filter>
<action android:name="com.winca.service.tv.ITVInterface" />
</intent-filter>
</service>
<service android:name="com.winca.service.aaux.AuxService" android:persistent="true" android:exported="true">
<intent-filter>
<action android:name="com.winca.service.aaux.IAuxInterface" />
</intent-filter>
</service>
<service android:name="com.winca.service.ipetronik.IpetronikService" android:persistent="true" android:exported="true">
<intent-filter>
<action android:name="com.winca.service.ipetronik.IIpetronikInterface" />
</intent-filter>
</service>
<service android:name="com.winca.service.Setting.SettingService" android:persistent="true" android:exported="true">
<intent-filter>
<action android:name="com.winca.service.Setting.ISettingInterface" />
</intent-filter>
</service>
<service android:name="com.winca.service.videorecorder.VideoRecorderService" android:persistent="true" android:exported="true">
<intent-filter>
<action android:name="com.winca.service.videorecorder.IVideoRecorderInterface" />
</intent-filter>
</service>
<service android:name="com.winca.service.ipod.IpodService" android:persistent="true" android:exported="true">
<intent-filter>
<action android:name="com.winca.service.ipod.IIpodInterface" />
</intent-filter>
</service>

I don't know if you have ever setup another launcher as default but doing it the radio application start in an empty screen, you press back button and it shows the radio interface where you can move the slider etc.. but you cannot ear nothing like if the radio or the audio hardware is not initialized. Stopping the com.winca.service.radio.IRadioInterface it does the same thing and running a third party launcher as default the winca service is not started at all at boot.

I hope i've explained it a little :P