Introduction Functions For IBM PC-LAN
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 NETCANCEL()  Releases the redirection of a local device
 NETDISK()    Determines whether a drive is local or resident on the server
 NETLOCNAME() Determines the name of a local redirected device
 NETPRINTER() Determines if the current printer is a local or network printer
 NETREDIR()   Redirects a local device to a server
 NETRMTNAME() Determines the name of a server device for a local device
 NETWORK()    Tests to see if a network is active