What does Virtual Box do if a live OS exceeds RAM?

[Bugmenot666]

Dear Board,


I'm currently running Virtual Box on a Mountain Lion Mac with 8GB RAM. I mostly use it to run a live version of Browserlinux, which I use to do online banking and to visit sites where I'm not sure about malware, and some other stuff. I have not given the guest machine a virtual hard drive; the only drive it has is the .iso with the live OS.

What I was wondering though is what happens if the live OS has used up all available RAM on my machine? Will it just refuse working? Or will virtual box allow it to write on my hard drive? Also, are there cases (e.g., chrashes) where the content of the live RAM disk is copied to my hard drive? If so, where could I find those?

In short: Are there any instances where a live system under virtual box leaves remnants on the hard drive and how could I inspect them?

Kind regards,
bm

[mpack]

A VM cannot use host paged memory: the VM will refuse to run if the host doesn't not have enough physical memory available.