If you are frequently logon to BI Dash Board and if you want to have a short cut key which can launch bi server page and also logons, then here is solution.
Open notepad type as below
[DEFAULT]
BASEURL= http://bi-server-name/analytics/saw.dll?Dashboard
[InternetShortcut]
URL= http:// bi-server-name/analytics/saw.dll?Dashboard?NQUser=Desire-User-Name&NQPassword=User-Password
Hotkey=1612
Then save this file as BIAnswers-or-whatever.url file extension must be .url and place it on desktop, now using ctrl+alt+L key press will launch BI Server url and also redirect you to default user preference page.