P53001 is a "container" hot fix that contains "member" hot fixes which will update your SAS software components.
See "What is a container hot fix?" in the SAS Hot Fix FAQ for more information on container and member hot fixes.
A manifest listing the contents of each of the following "member" hot fixes is available:
P54001 manifest for SAS Human Capital Management Mid-Tier 5.21
P56001 manifest for SAS Human Capital Management JPS Extension 5.21
P57001 manifest for SAS Human Capital Management Server 5.21