1) https://help.sap.com/saphelp_nw70/helpdata/en/f6/7d6f4151dc5758e10000000a1550b0/content.htm
2) i think it must be an inner page in portal to be working
if a new window needs to be used
you may be try to use server side cookie or memory id - set it in wda, pass the uniqe key to ui5 window as url param, create sicf service to read it, call sicf from ui5 to get the value