The following commands can be used to controlling scrolling behavior in the Reflection display:
To scroll all the way to the bottom (as Ctrl+End):
Session.ExecuteBuiltInFunction "HomeDown"
To scroll all the way to the bottom (as Ctrl+Home):
Session.ExecuteBuiltInFunction "HomeUp"
To scroll up one line (as Ctrl+UpArrow):
Session.ExecuteBuiltInFunction "ScrollUp"
To scroll down one line (as Ctrl+DownArrow)
Session.ExecuteBuiltInFunction "ScrollDown"
To scroll up one page (as Ctrl+Page Up)
Session.ExecuteBuiltInFunction "PrevPage"
To scroll down one page (as Ctrl+Page Down)
Session.ExecuteBuiltInFunction "NextPage"