http://www.advancedideas.com/Products/products.html
describes a pay-for cross-platform (Win/Mac/Unix/and Linux with
adjustments) product which claims to do such things. It sits on the
users' (victims?) machines waiting for messages, whether connected or
not.
No endorsement intended.
--John
-- John Baxter jwblist@olympus.net Port Ludlow, WA, USA Give a man a fish and you feed him for a day. Teach him to fish, and you get rid of him for the weekend. - To unsubscribe, email 'majordomo@livingston.com' with 'unsubscribe portmaster-users' in the body of the message. Searchable list archive: <URL:http://www.livingston.com/Tech/archive/>