| command | string | The command string that was passed to
         proc_open() | 
| pid | int | process id | 
| running | bool | 
         TRUE if the process is still running, FALSE if it has
         terminated
         | 
| signaled | bool | 
         TRUE if the child process has been terminated by
         an uncaught signal. Always set to FALSE on Windows.
         | 
| stopped | bool |  
         TRUE if the child process has been stopped by a 
         signal. Always set to FALSE on Windows.
         | 
| exitcode | int | 
         the exit code returned by the process (which is only
         meaningful if running is FALSE)
         | 
| termsig | int | 
         the number of the signal that caused the child process to terminate
         its execution (only meaningful if signaled is TRUE)
         | 
| stopsig | int | 
         the number of the signal that caused the child process to stop its
         execution (only meaningful if stopped is TRUE)
         |