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RedHat 9 (Linux i386) - man page for send (redhat section n)

send(n) 			       Tk Built-In Commands				  send(n)

_________________________________________________________________________________________________

NAME
       send - Execute a command in a different application

SYNOPSIS
       send ?options? app cmd ?arg arg ...?
_________________________________________________________________

DESCRIPTION
       This  command  arranges for cmd (and args) to be executed in the application named by app.
       It returns the result or error from that command execution.  App may be the  name  of  any
       application  whose  main window is on the display containing the sender's main window;  it
       need not be within the same process.  If no arg arguments are present, then the command to
       be  executed  is  contained  entirely  within  the  cmd argument.  If one or more args are
       present, they are concatenated to form the command to be executed, just as  for	the  eval
       command.

       If the initial arguments of the command begin with ``-'' they are treated as options.  The
       following options are currently defined:

       -async Requests asynchronous invocation.  In this case  the  send  command  will  complete
	      immediately  without  waiting  for  cmd  to complete in the target application;  no
	      result will be available and errors in the sent command will be  ignored.   If  the
	      target  application  is  in  the	same  process as the sending application then the
	      -async option is ignored.

       -displayof pathName
	      Specifies that the target application's main window is on the display of the window
	      given by pathName, instead of the display containing the application's main window.

       --     Serves  no  purpose except to terminate the list of options.  This option is needed
	      only if app could contain a leading ``-'' character.

APPLICATION NAMES
       The name of an application is set initially from the name of the program  or  script  that
       created	the application.  You can query and change the name of an application with the tk
       appname command.

DISABLING SENDS
       If the send command is removed from an application (e.g.  with the command rename send {})
       then  the  application will not respond to incoming send requests anymore,  nor will it be
       able to issue outgoing requests.  Communication can be reenabled by invoking the  tk  app-
       name command.

SECURITY
       The send command is potentially a serious security loophole. On Unix, any application that
       can connect to your X server can  send  scripts	to  your  applications.   These  incoming
       scripts	can use Tcl to read and write your files and invoke subprocesses under your name.
       Host-based access control such as that provided by xhost is particularly  insecure,  since
       it  allows  anyone  with  an account on particular hosts to connect to your server, and if
       disabled it allows anyone anywhere to connect to your server.   In  order  to  provide  at
       least  a  small	amount of security, Tk checks the access control being used by the server
       and rejects incoming sends unless (a) xhost-style access control  is  enabled  (i.e.  only
       certain hosts can establish connections) and (b) the list of enabled hosts is empty.  This
       means that applications cannot connect to your server unless they use some other  form  of
       authorization  such  as that provide by xauth.  Under Windows, send is currently disabled. |
       Most of the functionality is provided by the dde command instead.

KEYWORDS
       application, dde, name, remote execution, security, send 				  |

Tk					       4.0					  send(n)


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