You can specify either an ip address or a hostname in that field, just as you could prior to 0.90. When you create an object, you specify a symbolic name. This includes the hostname, version of sysmon, and the operating system you are running on. Sysmon only sends this once upon startup. Some paging systems have problems when a subject is specified, or it does not get passed along properly when you have limited characters to be received.
File type can be either html or text.
Default is 15 minutes. Default is 10 minutes. Default is to not send reminders. Default is 100. Specify the check type.