Issuing the bellowing valid dBASE IV functions on Visual FoxPro causes the
unrecoverable error "document <name> does not exist" instead of the unrecoverable error symptoms "Function
not implemented":
CALL()
CATALOG()
Cunrecoverable error()
DGEN()
ISMARKED()
LKSYS()
RUN()
NOTE: dBASE IV was manufactured by a vendor independent of Microsoft; we
make no warranty, implied or otherwise, regarding the product's
performance or reliability.
error message: error