Hmm, let me see...

OSK188 is a page for OSK Investment Bank's customers to log-in and do their own trading there without going through the dealers.
Hence, lower transaction fee. If I could remember correctly, it costs about +-RM30 per transaction (Buy/Sell) online as compared to +-RM40 through the dealers.

Therefore, you will have to register as their customer in order for you to do so.

Visit any of their branch, fill up a form, apply for a CDS account, pay a fee of RM20 I think and you can start trading in a few days time.

Whether it is safe of not, I cannot really comment.

By the way, Jupiter securities charge a much lower transaction fee at RM10 (min) per transactions. Furthermore, its more convenient as your orders will be sent straight to Bursa for approval instead of through the dealers first as per OSK. The last I heard though is that OSK is also moving towards the same way for their online trades. Not too sure whether it has been implemented yet. Maybe someone can share about this?

Good luck anyway TS