Cool! Thank you Peter. With a little help from http://www.obdev.at/resources/launchbar/help/RunningAppleScripts.html i created this:
on handle_string(theString)
tell application "Keyboard Maestro Engine"
make variable with properties {name:"Input Parameter", value:theString}
do script "Process Parameter"
end tell
end handle_string
And it works! Thanks again!