Single cmd session for all exec() calls - is this possible?

Hello My PHP script executes many cmd commands. Functions like "exec()" or "system()" cause that new cmd session is started, the command is executed and the session is closed. Unfortunately it is very slow process so I would like to increase performance and open one cmd session on the begin of my script and execute the commands such as in normal system opened cmd window and close it at the end of my PHP script. Does anybody know whether and (if yes) how can I do that? PS. I need the retrieve informations from previous command before executing next command because next command is strongly dependent on the results from previous command. Best regards Melmack