How to make Mac accessible to workgroup

Hey,
I have a MacBook Pro with Mac OS X Mountain Lion version 10.8.4. I'm connected to my home WiFi. I have a printer connected, a Samsung Smart TV and there's also my roommate Laptop (which works Windows 7). For some reason, none of the other devices can find, through WiFi, my Macbook. I can use my printer from my Mac, but my printer doesn't detect my Macbook when I try to scan using the device itself. Same goes for my Smart TV and my roommate computer, who can't see my Macbook connected on our Network.
Why is this happening and how can I make my Mac detectable to the other devices (PC, TV and Printer) on the Network?

Disable the firewall in the Security & Privacy preference pane.

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