Tcl proc arguments
ARGUMENTS Tcl_Interp *interp (in) Interpreter in which to create a new command or that contains a command. char *cmdName (in) Name of command. Tcl_ObjCmdProc *proc (in) Implementation of the new command: proc will be called whenever cmdName is invoked as a command. ClientData clientData (in) Arbitrary one-word value to pass to proc and deleteProc.