XPLMEnablePlugin

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XPLM_API int        XPLMEnablePlugin(
                         XPLMPluginID         inPluginID);

This routine enables a plug-in if it is not already enabled. It returns 1 if the plugin was enabled or successfully enables itself, 0 if it does not. Plugins may fail to enable (for example, if resources cannot be acquired) by returning 0 from their XPluginEnable callback.