Arm A: Vaccine placebo [AS PER AMENDMENT 08/23/01: ALVAC]; Arm B: Canarypox HIV-specific immunogen [AS PER AMENDMENT 08/23/01: ALVAC-HIV] (vCP1452); Arm C: 8-week cycles of IL-2 plus vaccine placebo [AS PER AMENDMENT 08/23/01: ALVAC]; Arm D: 8-week cycles of IL-2 plus canarypox HIV-specific immunogen [AS PER AMENDMENT 08/23/01: ALVAC-HIV] (vCP1452).