set bill "and Ben"
label .about -textvariable bill
button .first -text "First" -command {set bill Bradshaw}
button .second -text "Second" -command {set bill Bailey}
button .done -text quit -command exit
pack .about .first .second .done

Tcl/Tk's -textvariable option, on commands like label and button, allows you to have the contents of a variable display within you GUI (Graphic User Interface) ... and simply changing the value in the variable will change your display.

Quick, elegant, easy to program and easy to maintain.
(written 2007-12-15 21:45:33)

 T224 - Tcl/Tk - Events in Tk

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Using Tcl/Tk resource files for flexible applications
Making a variable dynamically visible in a Tcl/Tk GUI
The Horse goes on and on
Cliff Lift simulator- Lynton to Lynmouth - in Tcl/Tk
fill and expand on Tcl/Tk pack command
Curley brackets v double quotes - Tcl, Tk, Expect
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