Online talks.

Talking about "सद्दर्शनम्" over phone.

Audio-calls.  

Earlier I dealt with, and had a thorough reading of the following texts completed so far. :

ईशावास्योपनिषद्, 

माण्डूक्य उपनिषद्

केनोपनिषद् 

कठोपनिषद् 

Also. 

Very much satisfied and happy.