add multiple authenticated users to sharepoint list

Programacally if i have to add user field in SPList (2010) I will use User which corresponds to SPFieldUser class. But this will add only one authenticated user. is there any field which could add more users in same Box like the functionality already given in Sharepoint at many places.

I searched SPFieldType Enumeration but no results.

any idea.
thanks
aqibsp82Asked:
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aqibsp82Author Commented:
ive got it... SPFieldType which corresponds to SPFieldUser class. this class has properties to enable multiple users...
thanks
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