2.1.1023 Part 1 Section 22.214.171.1244, RTD
a. The standard does not describe restrictions on progID.
In Office, if progID does not reference an application that is registered and that implements IRTDServer, then #N/A is returned.
b. The standard does not describe how the application communicates with Excel.
In Office, the application must implement the IRTDServer interface.
c. The standard does not specify that argument-list may be left blank.
In Office, argument-list is required, but may be left blank.
d. The standard uses the following syntax: RTD(progID, [rtd-server], argument-list).
Office uses the following syntax: RTD(progID, rtd-server, argument-list).
e. In the standard, argument-list does not specify the maximum number of arguments.
In Office, argument-list may contain at most 253 arguments.
f. The standard describes the rtd-server argument as a string that is specific to the application with which RTD is communicating.
In Office, the rtd-server argument is used to perform a DCOM call to a remote RTD server. It is not specific to the RTD server. If there is no server and the application is run locally, the argument is left blank.