1. Memory. Depends on what do you mean, total amount. Anyway you can use:

?memory()
?sys(12)
?sys(1001)
?sys(23)
?sys(24)
?sys(1016)

run mem >> c:\hi.txt &&to store memory information in the file

2.?sys(2020)
?diskspace()


>How can I obtain these informations:
>
>- Total amount of memory
>- Total disk space / free disk space