Php check if executable is running

Question

Is it possible in Php to check wether an executable is running or not,

some Pseudocode:

if (processExists("notepad.exe")) {
    echo "exists";
} else {
    echo "doesn't exist";
}

Answer 1

You would only be able to check server-side processes, where PHP is running. JavaScript (client-side) isn't allowed that kind of access because of security.