Machine Vision

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can i use the parallel port for trigering a usb cam?

I m trying to use the parallel por like a in/out interface in order to control a automated vision inspection system, so i need 1 in and 2 out:
 
In is a triger for the system
Out are: A green led for the ok result and a red led for a nok result
 
I have read in the developer zone and i have sennthat is possible but i need a bit of help.
 
For example i must to know if is necesary to protect the port and what is its working voltage and max intensity.
And now i need how to programe it in labview, i m adquiring the image with the webcam and i want thet when i press a real buton i snap a picture,
 
Please help me if you know
 
Maintenance and production management studient.
 
Fernando Mora Torrijo
Zaragoza (Spain)
Fernando Mora Torrijo
Spanish studient
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Hello people:
 
None can help me? I only want to learn.
 
Thank you, i need you
 
Fernando Mora
Fernando Mora Torrijo
Spanish studient
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