ISBoxer is not allowed to move the cursor anywhere/anyhow other than where/how you move it. If your cursor being left somewhere on that window is causing your healer to heal the wrong people, then I would probably split the macro up or have ISBoxer replace it while multiboxing.. Otherwise, set up a Mapped Key with a Sync Cursor Action, and you can hit that key with your mouse anywhere you like to force the cursor to move to that position in the other window.