search the PDQ system, but merely accesses the information on the CD from his or her computer. However, the user must have a compact disc player that can communicate with the user's computer.
Because the treatment information in PDQ changes each month, vendors must regularly send out a new disc to each user. Therefore, CD-ROM versions of PDQ are offered by annual subscription. Information on commercial distributors that provide PDQ on compact disc is also available from the NCI on CancerFax.
