Can someone tell me what the bitwise AND and OR operators are?

I have a bunch of binary flags stored in an integer field and I need
to select only those where a certain flag is "on"...

In MS SQL Server it was "&" and "|" and I changed the pipe to two
pipes (||) and that appeard to work... but when I tried to change the
ampersand to two ampersands (&&) FireBird did not appear to like
that...

Thanks for any help,
--Raymond