Screen dimensions: whatever your client requires, it depends on what monitors they will be using & at what resolution. There is no "best".
Testing WebDirect: you log in the same as your users, through the same URL.
1 of 1 people found this helpful
The THEME is very vital to what shows best in any browser.
https://www.youtube.com/watch?v=jnlX9NIZWcE (video & get the sample database)