Your caps lock key seems to be stuck on.
There are numerous examples at
http://www.ni.com/devzone/idnet/ for DMMs. There is even a shipping example for the Agilent 34401 and this is on the Instrument I/O>Instrument Drivers palette. It is a GPIB or RS-232 instrument so you can look at how the serial is configured. There is also a lot of other resources at the above link. How and what a driver is, how to write one, etc. With LabVIEW 8.x, you also have a wizard for creating a driver at Tools>Instrumentation>Create Instrument Driver Project. You also have the Instrument I/O Assistant on the Instrument I/O palette. This is helpful if you don't want a full driver. In any case, I would recomend you get familiar with the remote control functions in a program such as hyperterminal before you start writing any code. When you've done that, you can test some of the functions with the shipping examples for serial communication.