This is a general question regarding the use of the CALL keyword...

I'm not referning to external procs, but rather to internal or intrinsic procs.

I have read that the use of the keyword CALL is considered to be obsolete and to have detrimental effects on the operation of the application.

Does anyone have any specific insight as to whether this is right or wrong, and what these effects might be?

Simple minded Example:
Msgbox "OK"
vs
CALL Msgbox("OK")