I need help in driving Visual SourceSafe 6.0 from VFP 6.0

loVSS = NewObject("SourceSafe") work, but I can't access anything from it.

All of these call give me "Class definition is not found":
loVSS = NewObject("SourceSafe.VSSDatabase")
loVSS = NewObject("SourceSafe.VSSItem")
loVSS = NewObject("SourceSafe.VSSCheckOut")

I would really appreciate if someone can give me the correct syntax or point me in the right section in the help file.

TIA