The "write request" to the LaserWriter was too big (an internal error).

Internal LaserWriter error: this request is already active (-4098).

Internal LaserWriter error: bad refnum (-4097).

No free CCB's are available for the Postscript printer.  (Perhaps you are trying to do too many things at once.)

Mysterious error -4095

Mysterious error -4094

Mysterious error -4093

Mysterious error -4092

Mysterious error -4091

Mysterious error -4090