Setting environment variable to run different versions of Quartus

[Altera_Forum]

Hi, 

 I have installed different versions of Quartus on my Windows PC. { Versions 13.1, 16.0 and 16.1} . I want to be able to run all versions on my PC { net necessarily at the same time } on my PC. Now my question is how to set the Quartus environment variables on my PC. My current environment variable is set as follow and I do not want to change every time I want to bring up different versions of Quartus: QUARTUS_ROOTDIR = C:\intelfpga\16.0\quartus Path = C:\intelFPGA\16.0\modelsim_ae\win32aloem QSYS_ROOTDIR = C:\intelFPGA\16.0\quartus\sopc_builder\bin SOPC_KIT_NIOS2 = C:\intelFPGA\16.0\nios2eds  Can I add the environment variables to different versions at the same line ? For example can i change to something like this: QUARTUS_ROOTDIR = C:\intelfpga\16.0\quartus ; C:\intelfpga\16.1\quartus ; C:\ialtera\13.1\quartus   and do the same to the other Quartus related environment variables?  Thanks

[Altera_Forum]

Old thread on this that may help: 

 http://www.alteraforum.com/forum/showthread.php?t=45514

[Altera_Forum]

--- Quote Start ---  Old thread on this that may help:  http://www.alteraforum.com/forum/showthread.php?t=45514  --- Quote End ---    My OS is Windows 10 54 bit. When I make a project with 16.0 and then open Quarts 16.1 ad then open that project , crazy things happens unless I manually change the environment variables.