HP xw4400 Workstation - Manual (Page 94)

HP Remote Graphics 4.2.0 User's Guide
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If the remote desktop displays either of these two states, then an RGS Single Sign-
on connection will work. If the remote desktop state differs from these requirements,
Single Sign-on will not work and the user will need to enter their credentials twice.
To support Single Sign-on in the RGS Sender, the custom RGS GINA (Graphical
Identification and Authentication) module, hprgina.dll, must be installed and
loaded by Window's WinLogon process. The RGS GINA module resides in the
C:\WINDOWS\system32
directory of the Sender's system. The hprgina.dll module is
loaded by Window's WinLogon.exe process at system boot up.
The RGS Sender enables Single Sign-on functionality with a correctly installed and
configured hprgina.dll module. Please refer to Installing & Enabling Single Sign-on
section to learn more about enabling RGS Single Sign-on.