You'd have to get the read/rrite Dev Kit in order to be able to write a data file. We don't sell that version anymore as far as I know. I believe we only sell the read-only version.
If you were to get the read/write version, you could write the data to a file, but you'd have to refresh the chart in MetaStock in order to see any updates since the last refresh. They wouldn't show up automatically.
You cannot write your own data vendor.
You can get data out of MetaStock in real time, but not get it in in real time. The closest would be to keep updating the file and have the user refresh the chart when they want to see the latest data.
Equis International, Inc.
A Reuters Company
90 S. 400 W Suite 620
SLC, UT 84101