Documentation for this [Tk] command can be found at: http://www.tcl.tk/man/tcl/TkCmd/destroy.htm : '''destroy''' ?''window''? ?''window ...''? Destroys each of the windows listed. It is not an error if ''window'' does not refer to a non-existent window. Windows to be destroyed may be any type of [widget], but since '''destroy''' works at the system resource level, things that are not Tk widgets are never destroyed by this command. <> ---- The destroy command is used to destroy Tk windows -- not just [toplevel] windows, it can just as well destroy individual widgets within a window (in which case the not explicitly destroyed siblings continue to exist). ---- I recently came across a major problem where my application was leaking huge amounts of memory (over 100 MB). I was using the Img extension and I was loading many graphics into memory, but I was not deleting them with ''image delete''. I fixed this problem by binding the close button and the event to a proc which deleted all photos loaded in memory once I was done with them. I learned that before destroying a toplevel, even in Tcl you have to release resources that you are not using anymore ;D ''Ro'' <> Tk syntax help | Arts and crafts of Tcl-Tk programming | Command