Greenpeace protests outside Hewlett-Packard.

Greenpeace members staged a protest outside Hewlett-Packard's Palo Alto headquarters this morning, carrying signs and launching a blimp with the words "HP = Harmful Products.''

Protesters also broadcast their message on a radio station -- 91.3 FM -- that could only be heard near the company's site along Page Mill Road.

The environmental group was protesting what it called the company's practice of using toxic materials in its computers and other products cannot be disposed of without hurting the environment, according to an announcement on the group's Web site.