Wojtow, You can change the name of the Idrac6 on the browser bar. What you need to do is access the Idrac via Web Interface, then select DRAC SETTINGS on the left. From there click on Networking. Near the bottom of the page you will see Register Drac on DNS with idrac-Svc tag listed. Remove the Svc Tag portion and add the hostname. So like this idrac-hostname (do NOT remove the idrac part of that, as without it there is no way to determine the host from the host drac) After completing this you will need to do a RACADM RACRESET on the drac and then everything should be displayed as you prefer.  NOTE: this is fine for a handful of systems. Let me know if you are wanting to do this on dozens and dozens of servers. As there is a process from the DNS.
iDRAC shows the service tag in the title bars of the web page windows it creates.   When one has windows and tabs open to multiple servers, it becomes difficult to keep track of which one is which. (you can find the hostname in the properties window, but that doesn't help find the window/tab that you want.)  Even if you've memorized the service tags or have a cheat sheet, it still doesn't help if you have several identical units from the same order with the same service tag.   It'd be really nice if the hostname was displayed in the titles instead.      
Display hostname in IDRAC web page window titles?