The sample function modules abap example program listed here uses the CALL FUNCTION found in 'SE37'.  For e.g. ALV. 
ABAP function module are procedures that are defined in function groups (special ABAP programs with type F) and can be called from any ABAP program.  All functions can be found at transaction code 'SE37'. 

If you need any ABAP help, do feel free to asked it in the Abapers forum.

ABAP Short cut Links

• ABAP Tips and Tricks 
• ABAP Questions 
• Sapscripts Tips
• BAPI Programming Tips 
• BDC Programming Tips 
• Smartforms Tips

• What is ALV Programming?
• What is SLIS in ALV
• Upload Logo -REUSE_ALV_COMMENTARY_WRITE
• How can I insert my company logo in the standard report?
• How to Refresh ALV List/Grid once it is displayed?
• Sample programs on ALV Grid
• REUSE_ALV_GRID_DISPLAY Functions Example
• function REUSE_ALV_FIELDCATALOG_MERGE
• ALV 'Classic' Creating User/Global Layout Variants
• How to use ALV for Hierarchical Lists
• Display a Secondary List using ALV Grid
• Download report to excel format (border, color cell, etc)
• Line Color in ALV Example
• Coloring Record in ALV Grid
• How to make ALV header like this?
• Sample ALV: Heading in ALV
• Test ALV Display With Header & Footer
• Use Simple ALV Functions to Make Reporting Easy
• ALV Reporting - Z_LIST_MATERIALS
• Reincarnation REUSE_ALV_FIELDCATALOG_MERGE
• REUSE_ALV_BLOCK_LIST_DISPLAY
• An Interactive ALV Report
• Example of a Simple ALV Grid Report
• ABAP Example Program ALV Grid Control
• What Are The Events In ALV
• Regarding Icon Display in ALV
• Aligning Data In ALV GRID Using Function Modules
• Important Main ALV Display Flow
• AT User-Commad in ALV Report
• Simple Program that Create Internal Table Dynamically
• Abap ALV Tree - A Complete Example Code
• Understanding ABAP List Viewer 1
• Understanding ABAP List Viewer 2
• Copy ALV Variants From One Program To Another
• ALV Reports Layout Management

• Creation Of Active Icon

• Pop a Date in Selection Screens
• Function to return next business day
• Find the diff. between two days in days, months and years
• Convert Current Date to Current Period
• ABAP Program: Output of Date Format
• How to use function  DATE_GET_WEEK
• FM to Get the Day for a Particular Date
• Determine Last Day of the Previous Month
• Date, Month and Popup Related Function Modules
• HOLIDAY_GET - Factory and Holiday Calendar

• Sending mail with attachment
• Sending mail with attachment report in Background
• Sending External email through SAP
• How can you send a fax from within ABAP/4 programs
• Make E-mail Sender of PO the PO Creators Name
• Sending Mail When The Purchase Order Is Released
• Sending Mutiple Excel Sheets As An Attachment

• Create Pivot Table in Excel with Desktop Office Integration
• Use SAP code to list how many docs in folder on your PC
• Uploading data directly from Excel file format
• Uploading multiple multitab Excel sheets or Ranges
• Excel Upload Alternative - kcd excel ole to int convert
• How to Open files from presentation server with MS Word
• Get the windows registry value
• Sample Coding For Converting Into PDF Format

• Prev. prog. have more than one instance running same time

• User Status Controlled When Sales Order Created
• Logic To Change The Distribution Status

• Post Measurement Documents To Notification

• Function Module To Return Head Of Organisation Unit
• Sort Employees As Positioned In OM Structure
• HR Report To See Description Per Qualification
• HRCA_COBL_CHECK - Cost Assignment Validation Checks
• Working Days Between Dates Using HR Calendar
• Program To Mass Update Infotype 0006

• What are ABAP Objects?
• ABAP Obj. Oriented SpreadSheet with "Unlimited" Power
• Bus. Add-in Understand ABAP OO Interface Concept
• Splash Screen in ABAP using OO
• Reading attribute of a BOR (Business Object)  in ABAP
• Object Oriented Programming Example

• GUI_* WS_* Function In Background, CSV Upload
• Download in Background in Excel Format
• Download/Upload Favorites from one PC to Another
• Download/Upload ABAP program from Local Harddisk
• LSMW and FTP Upload Chinese Or Non English Characters

• Creating Chart in ABAP
• Use BDS to Store Files Like Excel JPG

• A sample Tree Programming
• How to Create Tree Control

• Converting Number to Words
• Convert Month to Word
• Convert Spool List to HTML
• Insert a special Tab Delimited Character
• Print Number Value Without Thousand Separator
• Fig. to Words for India can be modified to any req.
• How can I get Ascii value of any letter
• Program For Printing Prime Number
• Convert One Currency To Another

• Use FM READ_TEXT to Read the Various Text
• How To Print a Header Text

• Change TCode Language Without Logout

• XML file to word document through SAP
• Sample XML Source Code For SAP

• ABAP POP-UP Window
• Pop-out box for user confirmation
• Pop a Message to specific SAP users
• Value Request For Parameter
• FM VRM_SET_VALUE To List Box
• Function Module for Encryption and Decryption
• Program To Change Text Into Password
• Take Values from Selection-Screen and Issue Message
• How to Restrict the Select Options
• Using Function Modules F4_FILENAME
• Program To Mass Reset Users Password

SAPGUI

• Make your SAPGUI Disappear and Appear Again

• To execute a dos command from ABAP
• Execute DOS Command in SAP Version 3.x
• WS_EXECUTE to called External Program

• ABAP Timers and Auto-refresh

• A SAP Pop-out Calculator

• RFC Call to Get Server List

• Issuing an Unix Command from ABAP
• SAP FTP Functions
• Background Jobs To List Dir Move Files

• List of ABAP Functions

• Reads Idoc Dispays Contents in Spreadsheet Format
• Program To Generate IDoc

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