This excerpt taken from the HPQ DEF 14A filed Jan 27, 2010.
Grants of Restricted Stock Units
As described above, a portion of an executive's target long-term incentive amount is delivered in the form of PRUs, with the remaining value awarded in grants of time-based restricted stock units. Grants of restricted stock units to the NEOs during fiscal 2009 were made under the HP 2000 Stock Plan. These awards have restrictions that lapse as to one-half of the number of units on the first and second anniversaries of the date of grant.
For more information on PRUs and grants of restricted stock units to the NEOs during fiscal 2009, see "Executive CompensationGrants of Plan-Based Awards in Fiscal 2009."