You can upload the PDB complex at http://www.ebi.ac.uk/thornton-srv/databases/pdbsum/Generate.html and wait for email. Once you get the result, PPIs will be indicated under section prot-prot. Make sure you have two separate chain IDs for each of the proteins in PDB file.

Thank you Dear Jitesh Doshi

PyMOL: find contacts. VMD: Hbonds plugin.

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discovery studio visualizer, Ligplot, and Schrodinger can use for this purpose.