Windows Waitfor Command

I recently discovered a command I didn’t know about (actually 2 commands). I never knew about waitfor command! Man, this would have been useful in some of my remote package pushing scripts. I guess this has been around since Server 2003 days.

WaitFor has two ways of working:
Syntax 1: to send a signal
    WAITFOR [/S system [/U user [/P [password]]]] /SI signal
Syntax 2: to wait for a signal
    WAITFOR [/T timeout] signal
Description:
    This tool sends, or waits for, a signal on a system. When /S is not
    specified, the signal will be broadcasted to all the systems in a
    domain. If /S is specified, then the signal will be sent only
    to the specified system.
Parameter List:
    /S     system         Specifies remote system to send signal to.
    /U     [domain]user  Specifies the user context under which
                          the command should execute.
    /P     [password]     Specifies the password for the given user context.
    /SI                   Sends the signal across the net to waiting machines
    /T     timeout        Number of seconds to wait for signal. Valid range
                          is 1 - 99999. Default is to wait forever for signal.
    signal                The name of the signal to wait for or to send.
    /?                    Displays this help message.
    NOTE: A system can wait for multiple unique signal names.
    The signal name cannot exceed 225 characters and cannot
    contain characters other than a-z, A-Z, 0-9 and ASCII
    characters in the range 128-255.
Examples:
    WAITFOR /?
    WAITFOR SetupReady
    WAITFOR CopyDone /T 100
    WAITFOR /SI SetupReady
    WAITFOR /S system  /U user /P password /SI CopyDone