How to start icewm?

Question

I installed icewm 1.2.13. Metacity is my default window manager. Usually, to replace window manager --replace option is used, e.g metacity --replace. But my version of icewm does not have this option. :

# icewm --help
IceWM: using /root/.icewm for private configuration files
Usage: icewm [OPTIONS]
Starts the IceWM window manager.

Options:
  --display=NAME      NAME of the X server to use.
  --client-id=ID      Client id to use when contacting session manager.
  --sync              Synchronize X11 commands.

  -c, --config=FILE   Load preferences from FILE.
  -t, --theme=FILE    Load theme from FILE.
  -x, --cursor=[small|medium|large|huge]  cursor size.
  -n, --no-configure  Ignore preferences file.

  -v, --version       Prints version information and exits.
  -h, --help          Prints this usage screen and exits.
  --restart           Don't use this: It's an internal flag.

Environment variables:
  ICEWM_PRIVCFG=PATH  Directory to use for user private configuration files,
                      "$HOME/.icewm/" by default.
  DISPLAY=NAME        Name of the X server to use, depends on Xlib by default.
  MAIL=URL            Location of your mailbox. If the schema is omitted
                      the local "file" schema is assumed.

Visit http://www.icewm.org/ for report bugs, support requests, comments...

When I try to start icewm I get this message:

# icewm
IceWM: using /root/.icewm for private configuration files
IceWM: xinerama: heads=1
IceWM: xinerama: 0 +0+0 1680x1050
IceWM: xinerama: heads=1
IceWM: xinerama: 0 +0+0 1680x1050
IceWM: Another window manager already running, exiting...

How to start icewm?

(I use Centos 6.5)

===EDIT===

Start with --replace option gives the same result:

# icewm --replace
IceWM: using /root/.icewm for private configuration files
IceWM: xinerama: heads=1
IceWM: xinerama: 0 +0+0 1680x1050
IceWM: xinerama: heads=1
IceWM: xinerama: 0 +0+0 1680x1050
IceWM: Another window manager already running, exiting...

===EDIT===

I found some solution but it uncomfortable. I changed system runlevel to 3. This disable graphical mode. When I am in text mode I command:

# which icewm
/path
# xinit -e /path

xterm is needed to run it.

Is there a better solution? I would like to simply replace window manager.

=====EDIT==== My linux release:

$ lsb_release -a
LSB Version:    :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID: CentOS
Description:    CentOS release 6.5 (Final)
Release:    6.5
Codename:   Final

Answer 1

All I can say is that icewm-session is the recommended way to start IceWM. It is also work in progress... So far I can start it using $ startx icewm-session, yet my global X settings are override by IceWM defaults, and an virtual terminal is opened by default once the IceWM session is up. To close the session I have to press Ctrl+C in that terminal, otherwise, it stays...

Enjoy! ;)