Custom Properties
To filter machines on the "Device Type" field, use CustomProperty4.
To filter machines on their Group, use CustomProperty1.
Email Field
To send a notification to multiple email addresses, separate the addresses with a comma. Don't use a semicolon. It doesn't work.
Bugs and Issues
You cannot include an apostrophe in a device name in a trigger's event filter. If you have a device name with an apostrophe, instead of matching the device name exactly using = sign, use the LIKE operator with an asterisk (wildcard) at the beginning or end of the name. (Wildcards must be at the beginning or end; they won't work in the middle.)
For example, the following will not work. It will break the trigger because the apostrophe in "John's" confuses the parser :
Event.EventType = 'Connected' AND Connection.ProcessType = 'Guest' and Session.SessionType = 'Access' AND Session.GuestMachineName = 'John's Mac'
Instead use this:
Event.EventType = 'Connected' AND Connection.ProcessType = 'Guest' and Session.SessionType = 'Access' AND Session.GuestMachineName LIKE 'John*'