Read these books to find out more about X Windows and HP-UX.
Using Your HP Workstation (B2615-90003)
HP Visual User Environment User's Guide (B1171-90079)
Introduction to the X Window System by Oliver Jones. Prentice
Hall, Englewood Cliffs, NJ:1989.
The Definitive Guides to the X Window System Volume Three: X Window
System User's Guide for Version 11 Release 5 by Tim O'Reilly and Valerie Quercia. O'Reilly and Associates, Petaluma, CA:1992.