CoStar App's Help file can be accessed one of several ways. You may access it under About CoStar App..., Apple menu; Help, under View menu; or the ? button above the Edit Text box.
The help file is named "CoStar Help" and must be stored in the CoStar App folder.
If neither the Help file nor the manual has answered your question, call (203) 661-9700 between 9 and 5 EST or FAX your question to (203) 661-1540.