Possibility on common lisp?

Hello I have a small problem in lisp. In made I am in first year of data
processing with the FAC and one teaches us the lisp in first half of the
year. One can choose the project which one wants, and I acknowledge that I
am not yet sure of what I will do (not too much idea), moreover if you
have ideas of projects to advise me do not hesitate. In short, I had in
the idea to make Tamagotchi. But I am vis-a-vis constraints, most obvious,
it is that when the firm user and reouvre his file lisp, one does not go
reinitialiser all the variables to zero, but to find themselves with part
of the program and to use variables which were stored for example on the
hard disk. Is this possible? There so yes have bonds towards precise
documentation on this subject? I would like to also know if one can be
useful oneself for example of the hour system in my script lisp? For
example that would be useful to me for the tamagotchi, kind during the
creation of the tamagotchi, to store the date and the hour system where
creation was made, and statement that Ben 24h after this date, the
tamagotchi has one day moreover, and a recursive call which will make that
all the 24h the tamagotchi will have one day of + (it is like that that I
intend to manage the variable age of the tamagotchi). But is what at least
it is realizable? I did not find any Doc. on this subject, in progress one
limited myself to one, data base hung and translator French-Morse, and me
I would like to go further. Thank you in advance of your answers

Sorry for my english, i use an online traductor.
.

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