If you have the TestStand software you should already have these help files. The help documents that explain all of the TS API calls can be located within the Help>>ActiveX API Reference in TS 1.0.x and Help>>TestStand Programmer Help in TS 2.0. You can also find this help by selecting Start>>Programs>>National Instruments>>National Intruments TestStand>>Online Help>>ActiveX API Reference from the Windows Start menu.
If you cannot find these files you can download the TS 1.0 API Help file from ftp://ftp.ni.com/support/teststand/updates You can get the TS 2.0 API help file by downloading the TS 2.0 Eval software from ftp://ftp.ni.com/evaluation/TestStand/ or by visiting the TestStand main page ni.com/teststand and following the links to get the evaluation version of the software. Hope this helps.
Richard McDonell National Instruments www.ni.com/ask