Question NDPS and IPP installation.

Under the installation of Novell client 4.91 sp1 you can choose a costume
installation and choose to install NDPS.
And after the installation of Novell client I installed IPP 4.06.

Shod I install both NDPS under the costume installation and IPP 4.06?
Or shod I only install nipp 4.06?

NW 6.5 sp2
Some old printers objects whose created whit nwadmin (hpgate.nlm)
And some new printers are created white iManger IPP (ndpsgw.nlm)

Getting abends on server 3 to 5 times a day associating DPLSV386.NLM

Additional Information:
The CPU encountered a problem executing code in DPLSV386.NLM. The
problem may be in that module or in data passed to that module by a
process owned by APACHE2.NLM.

CS = 0060 DS = 007B ES = 0068 FS = 007B GS = 007B SS = 0068
EAX = 207D86D0 EBX = 881F6248 ECX = 00000000 EDX = 00000000
ESI = 00000006 EDI = 881F6198 EBP = 881F5E08 ESP = 881F5CE4
EIP = 883EA21F FLAGS = 00010202
883EA21F 8B90DCBAA787 MOV EDX, [EAX-78584524]=?
EIP in DPLSV386.NLM at code start +0000421Fh
Access Location: 0xA82541AC

The violation occurred while processing the following instruction:
883EA21F 8B90DCBAA787 MOV EDX, [EAX-78584524]
883EA225 8B451C MOV EAX, [EBP+1C]
883EA228 8910 MOV [EAX], EDX
883EA22A 837DEC00 CMP [EBP-14], 00000000
883EA22E 742D JZ 883EA25D
883EA230 8B4514 MOV EAX, [EBP+14]
883EA233 8B4020 MOV EAX, [EAX+20]
883EA236 C7406C04000000 MOV [EAX+6C], 00000004
883EA23D 8B4514 MOV EAX, [EBP+14]
883EA240 FF7040 PUSH dword ptr [EAX+40]