Both SLIP and CSLIP come with HP-UX 10.00 and later. As of HP-UX 10.30,
the PPP daemon (pppd) also handles incoming SLIP and CSLIP connections.
In HP-UX 10.x, SLIP and CSLIP were handled by a program called ppl.
See slip(1).

For more information on CSLIP and SLIP refer to the manual:

o Installing SLIP/PPL Software on HP-UX ((Part No. 98194-90051):
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