SheerPower^® 4GL
A Guide to the SheerPower Language

Chapter 19
19	Writing Network Applications and Accessing Devices
19.1	Accessing Data from Webpages
19.2	Sending Email
19.3	Webserver CGI Interface
19.3.1	SheerPower 4GL CGI Interface Sample Program
19.3.2	Testing the CGI Interface
19.3.3	How the EVAL_HANDLER Program Works
19.3.4	Waiting for CGI Requests
19.3.5	Processing CGI Requests
19.3.6	Building CGI Custom HTTP Headers
19.3.7	CGI Interface Performance Considerations
19.3.8	Summary of CGI Environment Variables
19.4	Using TCP/IP and UDP Protocols
19.4.1	TCP/IP Protocol
19.4.2	UDP Protocol
19.5	Communication Port Support
Chapter 20
20	SheerPower Web Scripting
20.0.1	Chapter Overview
20.1	Running the Sample Script Programs
20.1.1	Sample Web Form Script Program
20.1.2	Sample Matrix Web Script Program
20.1.3	How the Matrix Sample Program Works
20.1.3.1	Script Area in Matrix.spsrc
20.1.3.2	Code Area in Matrix.spsrc
20.2	Defining CODE and SCRIPT Areas
20.3	SheerPower Script Areas
20.3.1	Embedding SheerPower Code Inside a Script Area
20.4	SheerPower Code Areas
20.4.1	Displaying Complex Expression Results
20.4.2	Embedding Script Areas in Code Areas with %INCLUDE
20.4.3	CGI Environment Symbols - GETSYMBOL$ Function
20.4.3.1	Embedded Code for CGI Symbol Lookups
20.5	High Performance PERSIST Tags
20.5.1	Marking Code to Run Once
20.6	Location of SheerPower Scripting Programs
20.6.1	How to Invoke a SheerPower Script Program in the Browser
Chapter 21
21	Calling Routines Written In Other Languages
21.1	LIBRARY
21.2	CALL
21.2.1	Passing Mechanisms
Appendix A
Appendix A	Coding Principles and Standards
Appendix B
Appendix B	Reserved Words
Appendix C
Appendix C	SheerPower's Error and Exception Messages
C.1	Compile Errors
C.2	Exceptions