[plug] Mounting an ISO image ?

[Max]

Please someone resfresh my memory, ( getting old i think)

what is the mount command string to mount an 'ISO' image 
so that the contents can be read without burning the disc and then 
mounting the disc ?
maybe i can't remember the -t  type for a data dvd ?
i seem to remember that have done it before for a movie dvd iso,
 now i cant find my notes as to what i am now doing wrong in the mount 
command string.... remembered the -loop bit, but the -t  part of it 
eludes me.
can someone post the full command string for a data dvd please ?