The Btrieve API is single-function in that most program actions are determined by an operation code parameter, rather than a function name. You should choose the API for your application based on whether you are most interested in cross-platform portability of code or the best possible performance on a particular platform.

To find the language-specific syntax required when calling a Btrieve API function, refer to the following section in Pervasive PSQL Programmer's Guide: Btrieve API Programming.

BTRVID allows an application to make a single transactional interface call that contains a clientID parameter, which the application can control. An application can use BTRVID to assign itself more than one client identity to the transactional interface and to execute operations for one client without affecting the state of the other clients. For more information, refer to Client ID.

In DOS applications, you must load the DOS Requester with the appropriate /T value. Set /T to equal the number of client IDs you use in the application. For more information about the DOS Requester, refer to Pervasive’s Getting Started With Pervasive PSQL manual.