>Thank you very much for the suggestion. Because of it I started a small project with 2 prg files and discovered that I am able to interact with Vault form the IDE in my home computer but not the one at the office, and also not from another machine at the office. So now the detective work starts.
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>Do you have any suggestions of what settings may cause problems?

I'd look into the .pjm file, and whether the vault client is the same version everywhere and whether it's registered as the SCC provider. Also, the name of the .pjm file should be the same as the name of the directory and the name of the virtual directory inside the Vault repository (at least that's how I got it to work temporarily, but then I was quite happy to give up integration when I had to reinstall Windows on my machine).