1.
Download the file ellhp.par.
This is a regular ASCII file containing a collection of
PARI routines for computing Heegner points.
2. In the directory where you have saved the file ellhp.par,
invoke PARI by typing
gp
from the UNIX command prompt.
From the PARI prompt type
\r ellhp.par
For on-line help you can then type
?ellhp