Maximum authorization needed to call a RFC

Dear All,
Please can anybody assist me with the maximum authorization  an communication user may require to call any RFC from SAP R/3 system.
Currently I am using S_RFC
Activity                        : 16
Name of RFC protected : *
Type of RFC object       : FUGR
Kind regards
Mithun Sharma

Hi,
System users (aka CPIC) users are needed for this.
See also http://help.sap.com/saphelp_nw04/helpdata/en/43/b2f17f95701bbde10000000a1553f7/frameset.htm
Eddy

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