go to previous form

hello,

i'm accessing vb from microsoft access 2007

my main question i've got to ask is; what's the command to open the previous form i was in (or previous page, or whatever - obviously i'd have to code something into a button, but i'm not sure what to do to fulfil this)

one thing i could do is make a button which just goes to the place where you most likely were before, but there is more than 1 place where you could have accessed this page, so it's a slight problem

tl;dr? how do you code a 'go to previous form/page'?

thanks in advance
- jeff