Maybe he meant whoever developed the system used client side VBscript..

http://www.w3schools.com/vbscript/vbscript_intro.asp

Client side VB Script only works in IE browsers and is not the same as VB.Net.

Javascript (supported by every major browser) is what should have been used in the Customs App.

http://www.readwriteweb.com/hack/2011/08/microsoft-bringing-html5-and-j.php