jdbc:sqlserver driver

hello:
I am trying to map a SQL server 2008r2:
and this is the convention I found on the net:

jdbc:sqlserver://server:port;DatabaseName=dbname

so I fill in:

jdbc:sqlserver://MyMachine\SQL Instance name:1433; XYZ=?????

The question is this:
DatabaseName=dbname - are not those the same (why would I put dbabasename=dbname)?

Is placing the IP of the machine better than  placing MyMachine\SQL Instance name ?


Thank you.