>It´s posible from a VFP applictaion (I´m using V 5.0) to detect when a user send a print job from any application using the print manager? I mean, like a counter of how many pages the user prints. I am talking about any kind of print job, not only VFP printings.

Use ADSI. Search the Microsoft KB (http://support.microsoft.com) on VFP and ADSI. There should be an article on printer control. You'll probably have to do this using a timer and just check once in a while.