ref: d7809194db6f52a6fc87a6d10bff7e78cc03c4d2
dir: /module/grid/demo/exproc.m/
Exproc : module { getslavedata : fn (lst: list of string); doblock : fn (block: int, bpath: string); readblock : fn (block: int, dir: string, chanout: chan of string): int; finish : fn (waittime: int, tkchan: chan of string); };