HP OmniBook 4150 Reference Manual page 64

Expanding the OmniBook
Using Plug-In Modules
3. Slide the module release latch forward as far as it will go.
4. Gently move the release latch back until the module pops out.
5. Grasp the underside of the module firmly, and pull out.
6. With the latch in the open position, slide the new plug-in module into the OmniBook
until flush with the unit.
7. Close the module release latch.
64 Reference Guide