Many desktop computers, traditional notebook computers, and Tablet PCs have
a PC Card slot or an ExpressCard slot, which is a special type of expansion slot that holds a PC Card or an ExpressCard module, respectively.
Most netbooks do not have a PC Card slot or ExpressCard slot. A
PC Card is a thin, credit card-sized removable
flash memory device that primarily is
used today to enable traditional notebook
computers and Tablet PCs to access the
Internet wirelessly. ExpressCard modules,
about one-half the size of PC Cards, are
the next generation of PC Cards. An
ExpressCard module, which can be used
as a removable flash memory device, adds
memory, communi cations, multimedia, and
security capabilities to computers.