Lexmark X422 Technical Reference Manual page 204

devmount
sets the Mounted device parameter for the specified device to
returns the value of the Mounted device parameter for the specified device. This
operator is in systemdict.
The boolean values indicate:
device successfully mounted, or was already mounted
device not mounted
If a device with the specified device name is not installed, an
undefinedfilename error occurs.
This operator may change the search order. See "Device Search Order" on
page 6-12.
Errors: invalidaccess, stackunderflow, undefinedfilename
devstatus
returns on the stack the status of a specified device. This operator is in
systemdict. A value of
device is present, five boolean values and three integers (see the following
description) followed by a value of
The five boolean values are:
, if the device is included in the search order and is to be searched for
the file operators that do not specify a device name. Same as the value of
the Searchable device parameter from the specified IODevice.
, if the device can be written to. This value is the same as the Writeable
device parameter from the specified IODevice.
, if the device supports named files. This value is the same as the
HasNames device parameter from the specified IODevice.
4-30
is returned if the device is not present. If the
are returned.
PostScript
. It also