cvs checkout -N -d xxx

[CHARLES HART, BLOOMBERG/ 499 PARK]

This works flawlessly:
$ mkdir WorkArea1
$ cd WorkArea1
$ cvs checkout file1 file2 mod1/file3

As does this (note the missing -N at the beginning):
$ cvs checkout -d WorkArea2 file1
$ cvs checkout -d WorkArea2 -N file2
$ cvs checkout -d WorkArea2 -N mod1/file3

But, the first and third commands of this sequence fail:
$ cvs checkout -d WorkArea3 -N file1
$ cvs checkout -d WorkArea3 file2
$ cvs checkout -d WorkArea3 mod1/file3

Can somebody clarify the purpose of the -N switch and how it interacts
 with -d, since the Cederqvist text doesn't seem to relate to this 
behavior at all.

-CTH