The Royal Observatory Edinburgh (ROE) maintains a data archive of observations made with the millimeter-wave James Clerk Maxwell Telescope (JCMT) in Hawaii. The archive contains data obtained since January 1992. Data become public after a proprietary period of one year. The observation log is maintained on-line and can be interrogated remotely using the ARCQUERY software (see text on La Palma (§3.3.13.) and Westerbork (§3.3.15.) below). Access is via SET HOST RLESIS (19527); login as ESIS, select menu option 1, answer REVAD, and login as ARCQUERY. Alternatively, one can telnet directly to host star.roe.ac.uk and login as arcquery. On-line documentation is available via telnet to star.roe.ac.uk, login as jcmtinform. Copies of a User's Guide and Quick Reference Sheet can be obtained from A. McLachlan at ROE (aml@star.roe.ac.uk). The JCMT Newsletter is edited by G. Watt at ROE (gdw@star.roe.ac.uk). [References: Davenhall (1993a), Hummel and Davenhall (1993).]