1) You don't lock and hide the scroll bar, you lock and hide the status area--the grey rectangle across the top of your screen.
2) Yes, there are several ways. One way is to write a script that opens the remote database and use File Options to select this script to be performed when your file opens.
3) There are two ways to do this in FileMaker (I'm assuming the remote database is a FileMaker database here).: 1) Define the same account name and password in your file as the remote database. FileMaker will then open the remote database with the same account name and password the user used to open the first file without opening a log in dialog. 2) In File Options for the remote database, set it to open automatically with an account name and password. While this second option achieves what you asked for, it's unlikely to be a practical option.