For no limit, use -1. Not supported on POP servers that don't support the TOP command. Useful with a slow connection. For no limit, use -1. Element names are the message ids.
Value is an integer defining the nth check upon which the message was last found.
Element names are the message ids. Values are integers defining the nth check upon which messages were last found. The following procedures are the only user-defined procedures that tkbiff calls. The argument is a list containing the ids. The message-specific data in the msg array is valid until this procedure returns.