How to Create Nested Data Frame

Dear Experts,

I have a data that looks like this.

file1="dat1.tab"
file2="dat2.tab"
dat1<-read.table(file1)
print(dat1)

   V1 V2
1  1 43
2  1 43
3  1 43

dat2<-read.table(file2)
print(dat2)

   V1 V2
1  1 43
2  1 21
3  1 43
4  1 43
5  1 24
6  0 24
The column V1 refer to labels and V2 to prediction score.

How can I create a data structure called HIV, that looks like this:

HIV

$hiv.dat1
$hiv.dat1$predictions
$hiv.dat1$predictions[[1]]
[1] 43 43 43
$hiv.dat$labels
$hiv.dat$labels[[1]]
[1] 1 1 1

$hiv.dat2
$hiv.dat2$predictions
$hiv.dat$predictions[[1]]
[1] 43 21 43 43 24 24
$hiv.dat2$labels
$hiv.dat2$labels[[1]]
[1] 1 1 1 1 1 0

Forgive me I am a newbies here.

- G.V.