start interaction between script and GUI rendering engine
Starts interaction between the script and the SCO Visual Tcl
graphical user interface (GUI) rendering engine.
Causes the script application to become
active and react to user and system actions.
Usually called as the last command of a script after the GUI
hierarchy is displayed with
Forces the original VtMainLoop command to end.
This can only be executed after VtMainloop is executed, from
inside a callback. This option leaves the interpreter and the
server still connected.
wrong number of arguments, argument not recognized,
or argument options not recognized