>The Client is running a browsing center , He wants the user to enter usage when login (45 Min ) and once the time is reached he wants a message box whether the user wants to continue yes or no if user says yes the system should allow him to continue else all the active window should be closed and the billing should print

VFP is not well suited to the OS-level manipulations necessary to lock out things owned by the Desktop or System, especially on a cross-pklatform basis; if nothing else, portions of the code to hook OS-level key and mouse functions will have to be written in another language such as VC++/Delphi/VB; I'd consider doing the bulk of the app in another language, perhaps with a VFP COM object to handle the relatively small amount of data manipulation reflected in this specification (in fact, there's nothing in this that would in any way recommend using VFP at all for the app.)

I'd rethink the choice of VFP as the primary tool and find a language with a greater ability to hook events in the Windows event loop outside the app process boundaries.