What exactly do you mean by input?
DW is a HTML editor. So you enter text into it directly.
You link to any other formats such as .pdf, .doc etc.
Are you looking for a way for others to update content on a webpage without using DW?
Yes, to your last statement about having others add content without having DW. When using DW, I can "insert" images but they have to be in an image format, jpeg, gif, etc. Most people are familiar with Word and it is very flexible about adding text & pictures, etc. I can' see a way to insert doc or pdf files into DW. The other alternate is to convert doc files to image files, but can't see a way to do that with Word.
OK, I see.
Dreamweaver is not a word processor. It is a HTML editor and produces HTML code which works on the web.
The web recognizes html, jpg, gif and png.
Browsers cannot read proprietary formats such as .doc unless they're converted to HTML.
Browsers also cannot read PDFs unless converted to HTML.
You can link to any file type you like such as .doc, .pdf. But you cannot insert them into a web page to be read by visitors.
For others to co-author (or contribute content for) web pages, they need to convert their .doc files into web format using Word. Or just cut-and-paste the text.
Or use a Content Management System (CMS).
The most popular are currently browser-based.