Show more than one post from specific ID

Hi to everyone,
I’m Luca from Italy.
I just want to show 3 post in a category-page starting from their ID using query_posts() (or something similar…).

I have a look in codex section and see that I can show posts in more than one category using this code.
query_posts(‘cat=2,6,17,38’);

so I try to use the same code for searching some ID like
query_posts(‘p=2234,2245,3455,2356’);
but it doesn’t work, it show me just the first one!
I also try with array but without success…

Is there anyone that can help me? I really need this because I want to compare different posts (3) starting from their ID (choosing by users).

Thanks in advance
Luca