I using 2 display to show the same window created in TCL-TK, in a C program. I tried to move the window to the other display , but the screen attributes , can not be changed and I created the same window twice , one with "-screen :0.0" and another with "-screen :0.1" , and I manage the windows with "withdraw and deiconify" to show in the monitor that I want in that moment. But the problem is that, only the variables of the second window created that a can continue set values, colours and others attributes. I was thing to use different interp (interp create slave ) , but I am not sure if this is the better way, and could not use this properly too. What is the better way to use this 2 display ? Thks