About the R/3 lock

To complement the SAP LUW concept, in which
bundled database changes are made in a single database LUW, the R/3
System also contains a lock mechanism, fully independent of database
locks, that allows you to set a lock that spans several dialog steps.
These locks are known as SAP locks.

ENQUEUE AND DEQUERE function modules are executed in a
special enqueue work process.

Within an R/3 System, enqueue work
processes run on a single application server. This server maintains a
central lock table for the entire R/3 System in its shared memory.

From: http://help.sap.com/saphelp_nw04/helpdata/EN/41/7af4c5a79e11d1950f0000e82de14a/content.htm

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