[apluslist] Interactive user input a script

[asubedi]

Hi,

How would one prompt for user input and get it from command line in an
A+ script? I have skimmed through the ref. manual and the tutorial but
did not find any function to do this. Also, what is the preferred method
for exiting from the script: sys.exit(0), _exit 0, or $off?

I am totally new to A+/APL so please bare my silly questions! 

Thanks,
alaska