[GreenKeys] Info needed

[Til128 at aol.com]

Hi Gang:
 
Back in the day, (before my time) does anyone recall the protocol for  
sending and receiving TTY pictures?
 
Was there a certain time/day?
 
Was there a time limit?  I understand you had to send your call sign  very 
15 minutes...how did that work?
 
Was anyone "in charge"
 
Just looking for general info - but if you want to be specific, that's OK  
too.
 
Thanks in advance.
 
Tom
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