You know ONLINE in the web browser and also status wise. Im not sure if you have any expereince with SolusVM, but in the admin panel next to the container summery it has a status lights;
Red = Stopped
Black = Suspended
Green = For started
Now to help make this clearer this is what i have just done in terminal;
[root@localhost ~]# vzctl start 105
Starting container ...
Container is mounted
Adding IP address(es): xx.xxx.xxx.xxx
Setting CPU limit: 400
Setting CPU units: 1000
Setting CPUs: 4
Container start in progress...
[root@localhost ~]# vzlist
CTID NPROC STATUS IP_ADDR HOSTNAME
106 79 running xx.xx.xx.xx domain.co.uk
[root@localhost ~]# vzctl enter 105
Container is not running
[root@localhost ~]#