Any name can be used interchangeably, and in order to help the reader's confusion, the writer of this document will slip every now and then and use any of these three terms.
Frames contain slots.
Slots could also be called members, fields, or elements. Each slot is named with a CaString, and occurs in no particular order. A frame may contain any number of slots, with any names. A JavaOriel driver may constrain a frame to only contain these members. More about this later in this document.