I'm trying to run a few commands through php exec() and am having a ton of trouble. #1, I can't change the drive letter the commands need to run on. #2, I can't run multiple commands - only the first command runs. 

example of what I'm trying to do

```
"cmd.exe /c \"cd E:\files; p4 -P -u user1 -c client1 sync ...\""

```

This is driving me absolutely nuts, I've tried everything and cannot change the drive letter. Even without changing the drive letter, only my first command will run. Any help is appreciated.