Reference Manual

NAME
close - close a device descriptor
SYNOPSIS
close device
DESCRIPTION
Command close takes as an argument a device number and invokes the NAT32 system call close on that device. Each device has a reference count that is incremented by the NAT32 system call open and decremented by the NAT32 system call close. Thus, if the device has been opened n times, the user must invoke the close command n times to close it.
SEE ALSO
devs