Hello KEVAL15,

the manual, which Marcjan has linked, contains the description
of all WinCC ANSI C funktions (standardfunktions and internal funktions)
Projectfunctions (you may have) and C-actions on events or properties
of picture-object, and Global Actions (you may have) are configured
by the developer of the project, and can therefore not be described
in a manual of WinCc.

Regards

Georg Berghof