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Set working directory? Read polynomial from text file?


Hi,

I have two questions:

1. How can I set working directory that when I restart Mathematica the
wotking directory is that I set previous time? I use
SetDirectory["dir"] but when I restart Mathematica the working
directory is the original "C:\Program file...".

2. I have a text file with polynomials in form as follows:
x^n+x^(n-1)+...x+1 (one polynomial per row). How can I read from this
file and Mathematica understand the value it reads as polynomial? I do
this: streamR=Openfile["file"];poly=Read[streamR,String], but "poly" is
String at the end and I can't use functions CoefficientList, Expand
etc.

Thanks.


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