USEINI

Using a fully qualified path name: 
msiexec.exe /i "IBM Personal Communications.msi" SAVEINI=C:\temp\
	MyCustom.ini ONLYINI=1 TRANSFORMS=\"1033.MST\"
Using an environment variable: 
E:\install\PCOMM_pkgs\xxx\install\PCOMM\setup.exe /v"/L*v 
	\"%temp%\pcsinst.log\" 
  USEINI=%PCOMM_ini%\MyCustom.ini ONLYINI=1 TRANSFORMS=\"1033.MST\""
msiexec.exe /i "IBM Personal Communications.msi" SAVEINI=%PCOMM_ini%\
	MyCustom.ini ONLYINI=1 TRANSFORMS=\"1033.MST\"

where xxx can be mls, chs, cht or kor depending on the installed PCOMM language.

Using UNC path names: 
E:\install\PCOMM_pkgs\xxx\install\PCOMM\setup.exe /v"/L*v 
	\"%temp%\pcsinst.log\" 
  USEINI=\\MachineName\PCOMM_ini\MyCustom.ini ONLYINI=1 
  TRANSFORMS=\"1033.MST\""
msiexec.exe /i "IBM Personal Communications.msi" SAVEINI=\\MachineName\PCOMM_ini\
	MyCustom.ini ONLYINI=1 TRANSFORMS=\"1033.MST\"

where xxx can be mls, chs, cht or kor depending on the installed PCOMM language.

The shared UNC path must have write access.