Tcl/Tk in a Nutshell

Name

send

send [options] app command [arg arg...]

Arrange for command (concatenated with any given args) to be evaluated in the application named by app and return the result or error from the evaluation. App may be the name of any application (as returned by the tk appname command) whose main window is on the same display as the sender’s main window (unless the -displayof option is given). This command is not supported under Windows or Macintosh platforms. Possible options are:

-async

Forces the send command to complete immediately without waiting for command to complete in target application. This option is ignored if the target is in the same process as the sender.

-displayof window

Specifies that the target application’s main window is on window’s display.

--

Terminates option processing in case app starts with a ''-'' character.

Security

For security reasons, the send mechanism will work only if the control mechanism being used by the X server has xhost-style access control enabled and the list of enabled hosts is empty. This means applications cannot connect to the server unless they use some more secure form of authorization, such as xauth. The send mechanism can be turned off (both sending and receiving) by removing the send command using rename send {}. Communication can be reenabled by invoking the tk appname command.