Text Messaging Over Screen Sharing

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Is there a way to send a text message to a person on the host computer over screen sharing?

I have a teenage son who uses our iMac to go on the Internet and I monitor his I usage with my MacBook from time to time with screen sharing. I want to be able to send him warning messages, if I think what he's doing or where he's going is not appropriate. I guess I could just use iChat, but that seems to be a bit of overkill. Is there an application I could use to write a message, send it (or drag it) and have it pop up on his screen?
 
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Apple Remote Desktop if you want to spend $500.
 
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take control of his keyboard and mouse, open textedit and write him a message. :D
 
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MacShane
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take control of his keyboard and mouse, open textedit and write him a message. :D

I tried that this morning, but he just closed Text Edit before I had a chance to type the entire message out. Is there a way to take control of the the mouse and keyboard remotely so that he can't use it while I'm sharing his screen?
 
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MacShane
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The "write command" in terminal looks like it would work well, but I'm unsure of the context for "ttyname". Would that be the computer name or IP address or something else? I'm going to test this out, when I get home from work.
 

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