new to prime ARG? INV?

[sirrick]

thanks both for your answers!.
yes I searched quite a bit for other questions that I have but this 2 I didn't find them.
I think I wasn't specific enough but the ARG function I was referring to, is the ARG function in the 48GX which returns the last 2 operators you use.
for example:

1 enter 2 enter X ARG
returns 1 and 2

thanks again!