It sounds like pretty much any Scripting Language could do this task easily. I just started learning scripting languages though, so. . I digress. Either way though, this question would be better suited for the Computer Science forum, or you could go ahead and post it in one of the Web development forums where you'd get a faster, better answer.
BestJewSinceJC
Posting Maven
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The first question to answer is if there is an "official" way to get data into the second application (an API of some kind). If the answer is no, then you will need to automate the filling of the form for the second application. One way to possibly do this is the Snoopy class. I did some searching and found it. The link is below. I haven't used it myself but I'm going to do a bit of experimenting. You can also do it yourself using the PHP HTTP functions.
http://sourceforge.net/projects/snoopy/
chrishea
Nearly a Posting Virtuoso
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