A communication PCI slot?

[DemonicDerek]

on the MSI K9N SLI Platinum there are 3 PCI slots 1 of which is orange and in the manufacturerd description it states that the orange PCI slot can be used as a communication slot. What do they mean by a communication slot? Also of the following what would be best to use that slot for?:
My sound card

or

My TV Tuner

[Rob]

I quote this information from hothardware.com

'So, what's with the orange PCI slot? We were curious, so we opened up the manual to find this "helpful" tidbit. "The orange PCI Slot also acts as a communication slot, which allows you to insert the communication card". Thanks for clearing that up, MSI. For the record, this slot functions perfectly as a standard 32-bit PCI slot. It may support some other feature with a proprietary "communication card", but whatever it is, we doubt its of very much importance'.

[ted]

I have a WinTV 150 card in that slot with no problems.