1. In a time sharing system, several subjects or processes may run on the same computer system concurrently. Each subject represents a different user. 在分时系统中，几个主体或进程可以同时在同一计算机系统上运行。每个主体代表一个不同的用户。
2. Depending on the machine being used. a UNIX system can support from one to over one hundred users. each concurrently running a different set of programs. 依靠当前所用的机器。UNIX系统能支援从一到在上百使用者。每个UNIX系统都能同时地运行一套不同的操作。
3. Article 115 The directors, supervisors, or managers of a membership stock exchange shall not serve concurrently as the director, supervisor, or manager of another stock exchange. 第115条（兼任之禁止）会员制证券交易所之董事、监事或经理人，不得为他证券交易所之董事、监事、监察人或经理人。
