04-21-2019
Yes, I know it is AIX, since this is the AIX forum
You can easily Google for the answer to such a simple question.
Quote:
The HMC is a PC connected to the mainframe. zSeries mainframes prior to the IBM System z9 used a modified version of OS/2 with custom software to provide the interface. System z9's HMC no longer uses OS/2, but instead uses a modified version of Linux with an OS/2 lookalike interface to ease transition as well as a new interface. Unlike the previous HMC application on OS/2, the new HMC is web-based which means that even local access is done via a web browser. Remote HMC access is available, although only over an SSL encrypted HTTP connection. The web-based nature means that there is no longer a difference between local console access and remote access, which means a remote user potentially has full control if authorized, allowing more flexibility for locating systems within data centers. IBM refers to the new HMC as a "closed platform" which does not allow the user to install software or access the command line interface to increase security and stability. The HMC is also firewalled by default with a minimal number of open ports for remote access.
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XON(1) General Commands Manual XON(1)
NAME
xon - start an X program on a remote machine
SYNOPSIS
xon remote-host [-access] [-debug] [-name window-name] [-nols] [-screen screen-no] [-user user-name] [command ...]
DESCRIPTION
Xon runs the specified command (default xterm -ls) on the remote machine using rsh, remsh, or rcmd. Xon passes the DISPLAY, XAUTHORITY and
XUSERFILESEARCHPATH environment variables to the remote command.
When no command is specified, xon runs 'xterm -ls'. It additionally specifies the application name to be 'xterm-remote-host' and the win-
dow title to be '-fIremote-host'.
Xon can only work when the remote host will allow you to log in without a password, by having an entry in the .rhosts file permitting
access.
OPTIONS
Note that the options follow the remote host name (as they do with rlogin).
-access
Runs xhost locally to add the remote host to the host access list in the X server. This won't work unless xhost is given permission
to modify the access list.
-debug Normally, xon disconnects the remote process from stdin, stdout and stderr to eliminate the daemon processes which usually connect
them across the network. Specifying the -debug option leaves them connected so that error messages from the remote execution are
sent back to the originating host.
-name window-name
This specifies a different application name and window title for the default command (xterm).
-nols Normally xon passes the -ls option to the remote xterm; this option suspends that behaviour.
-screen screen-no
This changes the screen number of the DISPLAY variable passed to the remote command.
-user user-name
By default, xon simply uses rsh/remsh/rcmd to connect to the remote machine using the same user name as on the local machine. This
option cause xon to specify an alternative user name. This will not work unless you have authorization to access the remote
account, by placing an appropriate entry in the remote users .rhosts file.
BUGS
Xon can get easily confused when the remote-host, user-name or various environment variable values contain white space.
Xon has no way to send the appropriate X authorization information to the remote host.
XFree86 Version 4.7.0 XON(1)