You can call fosivar_value from functions that are called as a result of the attloc=system-func FOSI setting.

The fosivar_value function works the same as #FOSI, except that it can be called from within functions invoked by the system-func feature.

window is the window ID that was passed as an argument to the function called by the system-func function. The value of this parameter can be -1.

varname is the name of the FOSI string variable or counter variable whose value is to be returned.

oid is the object identifier (OID) of the element in the user's document whose e-i-c is being processed