demand_load procname Attempt to load the specified procedure, either as an autoload function or by loading the package containing the procedure. If the package indexes have not been loaded for all package libraries in TCLPATH, they will be loaded. Out-of-date library indexes will be rebuilt if they are writable. The procedure returns 1 if the procedure was sucessfully loaded, or 0 if it was not. Duplicated package names are skipped, the first package of a given name found in the path is loaded.