To create such an environment, messages and screens of data pop between managers, 1(base) on rules established in the software by the users.
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【正确答案】 1、based    
【答案解析】 base...on...是固定短语，意思是“将……建立在……基础之上”，由此可知base与messages and screens构成动宾关系，用过去分词形式。