The CD+G format (audio + graphics), is an extension of the Compact Disc Digital Audio (CDDA) standard. It is supported by the AppleCD 300 CD-ROM, but without software to view the graphics on the disks, it acts like a standard audio CD-ROM. One application available on most online services is CD+G Player.
With the exception of Karoke CDs, the CD+G disc format never got full support from either record companies or the public. A majority of the pop CD+G discs came out in 1989 or 1990.
The CD+MM format (Audio + Multimedia) is not fully defined yet, so there isn't a standard for these discs. They can be Macintosh, Windows, or CD-I only, or they can be cross-platform. It is up to the developer of the disc to determine what platform they are going to support. These CD-ROM discs should also contain the platform requirements on the shipping box.