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You can use the following syntax to declare session data, which is not mapped in or out of WEBROUTINEs:
WEB_
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MAP FOR(*NONE)
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FIELDS field and/or list names with a # prefix OPTIONS(*PERSIST)
When a FOR(*NONE) declaration is used, the declared fields and lists will not be mapped in or out of WEBROUTINEs, but their values will be available in WEBROUTINE RDMLX across WEBROUTINE executions. If the above WEB_MAP is declared at WAM level, (i.e. after BEGIN_COM but outside of any WEBROUTINE block), then every WEBROUTINE, that requires a session (i.e. its initial SessionStatus is not None), will have access to these fields and lists as they form session state.