the tape is the record of transactions between buyers and sellers
The book is the orders - buy and sell orders that haven't been actioned yet as there price hasn't been met
Normally IHL doesn't move around all that much - volumes are low and orders remain pretty stagnant for a long time
The last couple of days has been very different
Even though the price hasn't moved all that much you've had big buy and sell orders being put in the book for short periods of time and moving more quickly (nothing like APT but for a micro cap it is noticeable)
What this normally means is that people are starting to trade it or trying to build a big position or trying to sell a big position
NFI if this is good or bad for the company but it is noticeably different to what has happened for quite some time now