hmm maybe stupid but i cant think something else...so,create a user to your machine,give the permission that you want. Also install VNC both. When the laptop is in the wireless network open VNC and let him to modify your wireless settings.
Just a possibility, but you could use PHP, obviously with authenticiation procedures or .htaccess password authentification. Use PHP's passthru command. Find out the command to change whatever you want to do on the machine. The passthru command will give the user feedback, also use the HTML tag <pre> to keep the PHP all nice and tidy when it feeds back the information from executing a command or a series of commands contained within a batch file.
Alternatively there is the PHP command 'exec' which simply executes, ideally a batch file with a list of commands. I would highly recommend passthru over exec as it gives feedback of the command, just as you would see in cmd.exe.
You can even dynamically create batch files using PHP, so as to execute commands at your own will be editing the files through the powerful PHP.
Please see the following links for a further read on passthru and exec: