The following is the procedure I used to successfully install the NEC 260R CD-ROM that I got with my P5-90 computer from Gateway into WARP. 

NOTE: BEFORE INSTALLING ANY PERIPHERALS YOU MUST COPY ALL THE FILES IN THE WINDOWS DIRECTORY (NOT THE SUBDIRECTORIES WITHIN WINDOWS SUCH AS "SYSTEM") INTO A SEPARATE DIRECTORY - SUCH AS OLDWIN
It has been my expereince that WARP screws something up in Windows and all I have to do is to copy the previously saved files from the oldwin subdirectory back into Windows. 

1) Go to OS2 Selective Install utility
2) Select CD-ROM Device Support
3) Select NEC260 from the list of CD-ROMS (it may say NEC260v)
4) Select OK
5) Select OK
6) Insert Warp Disk 2 into drive A
7) Select INSTALL (do not mark any options)
8) Follow instruction on screen
9) Select OK
10) DO NOT GET OUT OF OS/2 YET, select Drive C in the DRIVES icon, find file
CONFIG.SYS in root directory. (Note CONFIG.SYS also exists in OS2/INSTALL and OS2/BOOT directories, ignore these, find the CONFIG.SYS in your root directory)

11) Click mouse twice on the CONFIG.SYS file, add or modify  the following lines:

BASEDEV=IBM1S506.ADD  is changed to BASEDEV=IBM1S506.ADD /A:1 /U:0 /ATAPI

BASEDEV=IBMIDECD.FLT /Q is changed to BASEDEV=IBMIDECD.FLT

DEVICE=C:\OS2\BOOT\OS2CDROM.DMD /Q is changed to DEVICE=C:\OS2\BOOT\OS2CDROM.DMD

-note, some of these lines may not exist, in that case just add the correct version listed

the lines should now read:

BASEDEV=IBM1S506.ADD /A:1 /U:0 /ATAPI
BASEDEV=IBMIDECD.FLT
DEVICE=C:\OS2\BOOT\OS2CDROM.DMD

12) Save CONFIG.SYS as TEXT file 
13) Exit OS/2 and then reboot

PRINTER INSTALLATION
OS/2 asks for Windows disks 1 and 6 for HP Laserjet installation. What happens then is that later when you try to run WINDOWS separately from OS/2 you may get a PROGMAN error. I have no idea where the error is, I just recopy all the files in the WINDOWS directory that I saved previously back into the WINDOWS directory and it works.