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%piserver% --> PI Server (this is an environment variable for PI server home path)
%pihome%--> Environment variable for client (32 bit)
%pihome64%--> 64 bit
Additional information :
Live library: PI Server
The PIHOME and PIHOME64 environment variables are set as part of the PI Data Archive installation process. After installation, on a 64-bit computer both PIHOME and PIHOME64 will likely be set, and on a 32-bit computer PIHOME, only, will be set.
- PIHOME is the directory under which most 32-bit client applications are installed (on either 32-bit or 64-bit operating systems). PIHOME is defined in %windir%\pipc.ini and by default points to c:\program files(x86)\pipc on 32-bit machines and to c:\program files\pipc on 64-bit machines.
- PIHOME64 is the directory under which most 64-bit client applications are installed. By default, PIHOME64 points to c:\program files\pipc
Thanks Lal for the information.