Windows 10 is an operating system, not an application software. Operating systems manage the hardware and software resources of a computer and serve as a platform for running application software like Photoshop, PageMaker, and MS-Excel, which are tools designed for specific tasks.

ARPANET (Advanced Research Projects Agency Network) was the first network, developed in 1969 by the U.S. Department of Defense.

A digital signature is not a scanned image of a signature but a cryptographic method used for authentication and ensuring the integrity of digital documents. It is created by encrypting information with a private key and cannot be easily duplicated, making it highly secure.

Microsoft Excel 2019 supports 1,048,576 rows and 16,384 columns (labeled as A to XFD). These limits are consistent across most modern versions of Excel, allowing for extensive data handling and analysis.

In Bluetooth technology, a piconet is a small network consisting of one master device and up to seven active slave devices. Multiple piconets can interconnect to form a larger network called a scatternet, allowing devices to communicate across different piconets.