Execute a function module from sapportal without to create the users in R/3

I have a pdk application in sapportal. This pdk application will be execute for any sapportal users which don't have R/3 users. The problem is the follow.. in this pdk application there is a R/3 function module that must be execute, ¿how can i execute this function module without to create the users in R/3?

Hi Michael,
Create a JSP dyn page application. Hope you have the table name and in R/3 there will be Function modules already available which we also can reffer.
Then from this JSP dyn page application, call this particular function table.
wE DON'T  have to create a user for this.
Regards
Arun Jacob
P.S please award points for helpful suggestions.

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