Are you looking for the feasibility?
One way is to access everything by using Portals
BW
e.g. DEV portal, QA Portal, PRD portal i.e
first logon to Portal and access respective environments from there.
second: Single logon should be enough for Bex broadcaster, ABAP browser, RRMX etc
This is in general about BW and ERP as well.
BPC and BO
As this is web based, the same is applicable.except crystal report. I believe when you sign on using web link, you can but not using Thick client from start menu--> programs.
HANA
Not sure about it. But you can read it from Master guide doc.
-Suvesh