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RTFM is the usual advice in these situations. What you are asking is covered within the first couple of chapters.
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Probably is referring to "roll up". That is, roll the stack up. To access this function, you'll have to do a:
XEQ ALPHA R shift N.
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The HP41 has many more functions than keys, so there's not always a key to press to enter a function. What you do in that case is press <XEQ> then <alpha>, then type in the name of the function, then press <alpha> again. This
works both in 'run' mode (to execute a function not on the keyboard) and in program mode (to enter the function a a program line).
So in your case, press <XEQ> <alpha> R ^ <alpha> (where ^ is typed as <shift> <enter> -- there's a label on the back giving the shifted alpha characters).
Oh yes <xxx> means press the key with 'xxx' on it.
I would recomend trying to get the user manual, though. It's got a lot of good information in it. Another good book is 'Extend your HP41' by Wlodek Mier-J. That's probably the most useful 3rd party book for general users -- it covers everything from turning the machine on to
synthetic programming. I use my copy all the time.