We have Chromecast Devices set-up on the TVs at the church, so it is not hard to send your screen, i.e. duplicate the display on your phone, table or computer to these TVs.
If you receive or download a PDF file which has form fields in it that need to be filled and and/or possibly require a signature, this can be done using the free ADOBE ACROBAT READER DC tool.
If you have tried to view a web page link, but you cannot see the latest version, it could be that you need to clear the cache on your phone or computer.