I AM USING LABVIEW 7.1. I BUILD ONE APPLICATION. IN THAT APPLICATION I USED MSCOMM ACTIVEX FOR SERIAL COMMUNICATION TO MY PLC. ALSO I USED TOOLBAR , STATUS BAR ACTIVEX IN MY APPLICATION. IT WORKS OK. BUT AFTER SOME TIME SOFTWARE GET HANGS DUE TO INSUFFICIENT MEMORY. I FOUND THAT AFTER 3SECOND THAT EXE SIZE IN MEMORY GET INCREASED BY 4K. WHY DON'T KNOW. PLEASE TELL WHY MEMORY SIZED INCREASED.