You really need to be more specific in describing your current setup, and what components you would consider purchasing/utilizing. Make, models, type of connections, cable or satellite providers, etc. is always helpful in the context of such a discussion/inquiry.
That said, relatively recent products such as Slingbox make much of what you describe a reality. The actual details of what you would require do depend though on what hardware you utilize.
Is there a relatively simple way to stream video from my computer to my TV on my wireless network? Is it also possible to do the reverse - from my TV to my computer? All suggestions appreciated. Thanks in advance.