login to multiple SAP systems using pwd of single SAP system

Hi All,

We have 3 different SAP servers, with sids: ECD, BWD, HRD.

for each user, a user with the same username is created in all three systems.

the user does not want to maintain 3 different passwords, instead only single password to be used in all systems. i.e. when he changes the password in system ECD, the changed password should work in other systems BWD and HRD as well.

if we were using SAP EP, we checked the possiblity of username based SSO and having portal login using only on system ECD.

but we are not using the portal, and all the users will access 3 sap systems using SAPGUI.

is there any way, where one system's password will work to login to other systems.

thanks in advance,

Madhu_1980