Window-to-window signature means that the signature is complete, not a seal, but a signature. According to the relevant provisions of People's Republic of China (PRC) Electronic Signature Law, an electronic signature shall be regarded as reliable if it meets the following conditions at the same time. Reliable electronic signature has the same legal effect as handwritten signature or seal, including the characteristics of exclusiveness, exclusive control, exclusive storage and traceability of electronic signature. One-window service is the latest electronic pass service software. Users can apply for digital registration and authentication online through the software after confirming their identity in official website version of One Window app.