Product by National Instruments company. Allows programming in a language called G. Has extensive/well documented libraries that come in handy when you are solving all kinds of 'automation' problems.
Connects to many instruments/devices by the use of VISA,IVI,GPIB,TCP/IP or UDP,ActiveX... name it LabVIEW plays it.
Programming in LV is (even more) fun (than programming Tcl ;-)) because you do not need to type your program (G), you just draw it.
(The result is something that is sometimes called spagetti-code, in the real meaning of spagetti)
The most fun part is that it can be glued together with Tcl by the use of tcom as mentioned in adhere.
References: [L1 ]