External execution macro + log support

Hello,

I use WinEdt for quite a while now, but I am not very familiar
with the Macro language.

I have a java program I would like to execute and capture the
results in a log file. What I had in mind was to execute a bat
file such as

java -jar myjar.jar %1 >> %2

where %1 would be a set of parameters sent by winedt,
say the current file name or something like it, and %2
would be some log file name that I would like to integrate
within find errors window (usually docked underneath the
editor window itself).

I looked into the manuals, and the Texify.edt, Latex.edt,
but it sounded quite a task to understand it all. And I
wondered if somebody had already done something similar,
or could give me some hints/tips on how to achieve that, please.

Many thanks 

Best,
Leo