A method is provided which eliminates redundancy from the shadow PT operation performed by the virtual machine monitor when the guest operating system running on a virtual machine updates a guest page table address. More particularly, the present invention relates to an immobilized DNA polymerase whose activity is maximally preserved by masking the active site of the DNA polymerase and optimizing interaction of the masked molecule to the substrate material. 1 to 10 mol % and a film containing the same. The communication sent in response may include a performance measurement of the channel used to provide the channel identification data.