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DIFROM compares the version number from the second line of the DIFROM routine with the VA FileMan version node from the M Operating System file. This node is ^DD("VERSION"). If the version numbers do not match, an error message is displayed and the program exits.
DIFROM then makes sure DUZ(0)["@". If not, the developer will see an error message and the program exits.
Reviewed/Updated: March 10, 2007