Thanks to all!

* As far as sam windows being unresponsive, of the reasons suggested, it seems that in my case I am not always entering commands on the last line. When this happens, the sam window does not respond to commands and gets stuck and I am only thereafter able to enter a command if I save the current file. This also sometimes happens after I hit "u". Not sure why.

* X/pathregex/b is a great tip. Thanks. 

* I did try using 'send' but it gives me a ?bad delimiter `e' error.

* Thank you for the clarification and resources Charles. I will go through the paper you recommended. Thanks too for helping me distinguish the newline errors. I had not noticed the difference between them.

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