What is Adobe Writer?

There is no technology called "Adobe Writer." It's possible you're referring to Adobe Acrobat, specifically the features used for creating and editing PDF documents. Adobe Acrobat allows users to write, edit, and format text within PDF files, similar to a word processor. If the user meant Adobe Acrobat, it is commonly used for creating, viewing, manipulating, printing, and managing Portable Document Format (PDF) files. These tasks include writing and editing text in existing PDF documents, or creating PDF documents from other formats.