CAA的PDM

Before having access to the three PDM commands, you have to:
  
rebuild the code of the use-case  
activate xPDM toolbar. To do so, follow the instruction below:  
locate and edit the CAAxPDMInterfaces.edu.dico file that is located in the "code\dictionary\" folder of your runtime view  
remove the comment at the beginning of the last line.
The content of the file should now look like:  
#
# uncomment the following line to activate the xPDM toolbar
#
  
CAAxPDMAddin CATIPrsConfigurationAddin libCAAxPDMController
CAAxPDMAddin CATIPrtCfgAddin libCAAxPDMController
  
save the modified file.
Now the xPDM toolbar will be available the next time you launch CATIA V5.  
define the "pseudo" PDM "vault" and the "work" folder. They are defined as Windows/UNIX environment variables.  
On Windows, type:  
set CAAxPDMVaultDir=E:\xPDM\Vault  
set CAAxPDMWorkDir=E:\xPDM\Work  
里面的
define the "pseudo" PDM "vault" and the "work" folder. They are defined as Windows/UNIX environment variables.  
On Windows, type:  
set CAAxPDMVaultDir=E:\xPDM\Vault  
set CAAxPDMWorkDir=E:\xPDM\Work  
是什么意思？
environment variables是指环境变量吗？我在里面设置了，不行。应该如何操作。请指教！