Hi,
LabVIEW 5.1 and higher offer MATLAB script nodes that let you enter MTALAB scripts in LabVIEW and interface with MATLAB. As for communicating with other programming languages, you can create DLLs in other programming languages and call these DLLs in LabVIEW using the Call Library Function node. For more information on calling external code in LAbVIEW, please refer to the "Using External Code in LabVIEW" manual in the LabVIEw bookshelf.
Ankita