As an aside to what YongAn suggests, could you describe the problem you are attempting to solve? IOW, is there a particular reason why you need to do this? There are other non-programatic things you can do -- like set SELECTserver to only allow checkout for a particular duration, or not at all. Having a better understanding of what it is you want to achieve (and more importantly, why) may help identify alternatives you can try that may be better options.
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