say if i plan to use a chat software like humanclick and the chat software resides on my server...what are the security issues invovled if i ask my existing investors to say give theirPIN numbers or anyother number which we allot them...which will let the cutomer rep. to pull up the investor details and allow transactions like transfer of investments from one scheme to another, redemptions, change of address...etc???
If this can be secured...can i use SSL browsers to allow investors sending the same by email?

thanks in advance