Besides using the Excel Plug-in to generate Historical RTD links, you can create RTD links by directly entering the RTD formula.
=RTD("ESRTD",,"*H", <Symbol>,<Field>,<Agg>,<Start>, <Index>)
*H - Denotes History Function
Symbol - Symbol
Field - Field Name
Possible Field Names:
Open
High
Low
Last
OpenInt
Volume
Symbol
BarTime
Agg - Data Interval/Aggregation
D - Daily
W - Weekly
M - Monthly
I<n> - Intraday with specific number of minutes
Start - Starting Date (Optional). Default is current day
Index - Offset from Current Day. Default is Zero. Number of Bars prior to Start Date/Current Day
* Start and Index are mutually exclusive.