hi all, i work for a small custom software company specializing in accounting software. our team has been developing an accounting package for a business firm. this firm markets this package starting with the trial version that lasts for 30 days. we know that some customers may use the trial version that expires in 30 days and then un-install it, and re-install it and use it for another 30 days. my question is: is there anyway to determine if a particular pc has ever installed this package, even if they have un-installed it before installation?