What is the difference between Short Subject Line and Alternate Subject Line in the File/Settings of the WinSpool/400 Email Report Server

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The emails subject line is as follows:

Date – Report Name (Pages) Form Type – Report ID – Job Name – Number( ) - Time 

Alternate Subject Line Enabled

The emails subject line is as follows:

Report Name (Pages) Form Type – Report ID – Job Name – Date - Time	

Short Subject Line Enabled

The emails subject line is as follows:

Date – Report Name (Pages) 	

Short & Alternate Subject Line Enabled

The emails subject line is as follows:

Report Name (Pages) - Date