For Serenum PnP modems the following commented INF section illustrate the technique.
; Below, exclude generic friendly strings from pick list
[ControlFlags]
ExcludeFromSelect=SERENUM\PPI1907 ; PC288LCD V.34 PNP
; Three unimodem ID strings appear below, generally use all applicable
; modem ID strings installed by modem24.
; Notice that commas separate each ID - this is the only format allowed
[Modem24.NoResDup]
UNIMODEMC5D7521C, UNIMODEM7750BAAF, UNIMODEM705078AF
; Provide all possible legacy ID strings (using Modem24 install)
; appearing in this INF
; Modem has two entries: one for serenum ID and one for the
; unimodem ID
[Models]
%Modem41PNP% = Modem24, SERENUM\PPI1907 ; PC288LCD V.34
%Modem41% = Modem24, UNIMODEMC5D7521C ; PC288LCD V.34
[Strings]
Mfg = "Practical Peripherals"
odem41PNP="Practical Peripherals PC288LCD V.34 Plug & Play"
Modem41="Practical Peripherals PC288LCD V.34"