Retrive Logged account info in custom report script

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Hi guys, I have a incident report that use a custom script. I need to retrive some custom fields from the loggend account to use in the script to build the report correct(I need to filter the report using a custom field os the account)

 

 

How can I retrive this field in the  custom script? 

 

It is possible to retrve  the session id in this script? If yes, I can use a ROQL to retrive this value...

 

Thanks!