$MessageList
 Usage
• $MessageList is a global variable that gives a list of the names of messages generated during the evaluation of the current input line.
Notes
• Whenever a message is output, its name, wrapped with HoldForm is appended to $MessageList. • With the standard Mathematica main loop, $MessageList is reset to {} when the processing of a particular input line is complete. • You can reset $MessageList during a computation. • New in Version 2.
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