Here's what MSDN says:
Execution context identifier (ECID). The execution context ID of a given thread associated with a specific SPID.
ECID = {0,1,2,3, ...n}, where 0 always represents the main or parent thread, and {1,2,3, ...n} represent the subthreads.
From: http://msdn.microsoft.com/en-us/library/ms188246.aspx
Does that help?
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