I would like to know how to lock the internet while still being able to print a document.

ZA Security Suite v 7.0.408 installed and
the Z100g Zone Alarm Wireless
Router. My desktop & laptop are hooked up to it, secure network.

I have enabled printer sharing on both computers.
That works great.
For security reasons, I would like to lock my desktop (no internet access) while using an accounting program and print a page.
Both settings, 'Stop all internet activities' and 'Engage internet lock'

do not allow my desktop to communicate to the router to print the page.
Only prints the page when I disengage the locks.
Is there any setting I can select to lock the internet and print a file?
Thank you for your help.
I am pretty new to all this stuff.

Operating System:Windows XP Home Edition
Software Version:7.0
Product Name:ZoneAlarm Internet Security Suite