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21.	What are the options that are available to communicate with external applications in Net Weaver?
	The following are the two important connectors that make communication with external applications possible: SAP .NET – Helps in communicating with Microsoft .Net applications. You can directly code applications in Microsoft Visual Studio .Net to access SAP data using the SAP .NET connector. SAP Java Connector (JCO) – Helps in communicating with applications written in Java. JCO provides a standard interface for Java applications to communicate with SAP.
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22.	As an administrator, what steps should you perform before restarting the SAP server?
	The following things should be checked before restarting the server: Check whether any background jobs are running. This can be checked by using Tcode SM37. Check if any user is logged on. This can be checked by using Tcode SM04. The server should be restarted during off working hours to minimize business downtime.
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23.	What is typical about SAP HR security implementation?
	In SAP, the HR security is based on the info types apart from the authorization for Tcodes.
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24.	Where is a lock table stored in SAP?
	Lock table in SAP is stored in the main shared memory of the enqueue server.
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