In Leash, F1 are the online Help keys. Here's what they do:
Pressing F1...gets you...
in the Leash main window: Leash Help Topics -- click the one you need.
in Leash Help Topics: Contents for How To Use Help -- list of topics explaining the features and functions of Windows online help -- click the one you need.
in a Leash dialogue box: context-sensitive help, i.e., the specific topic that explains where you are and what you're doing.
at an error message: explanation for the error message.