Apple has developed the MAC operating system with GUI. It was developed to use with the Macintosh computer system. Originally the MAC was developed in 1984. You can easily sign your document even when you don’t have any digital pen, you just need to sign on white paper and keep it in front of the webcam. It will automatically convert it into a digital signature. Except signing documents, this feature of preview also allows you to annotate them in the way you want. You are allowed to add your own text, comments, highlight text etc this is the silent feature of Mac os. If any user have any issue with this operating system then they can make a call on toll-free helpline which invoked by Mac customer service phone number 1-855-550-2552.
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