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Introduction
The amount of information available about XI is impressive: SDN articles, the SAP Library documentation, course materials, eLearning, online forums, blogs etc. However, when you're first starting out as an XI developer, navigating the available information can be a daunting task. The "cheat sheet" below is aimed at new XI developers and is meant as a starting point in the world of XI. It gives you an overview of the most frequently used transactions and URLs. The list is by no means exhaustive; I suggest that you print it out, keep it by your PC and add to it as you learn new tools.
Have fun exploring XI!
XI transactions
SXMB_IFR   
Start Integration Builder
SXMB_MONI   
Integration Engine - Monitoring
SXI_MONITOR   
XI: Message Monitoring
SLDCHECK   
Test SLD Connection
SLDAPICUST   
SLD API Customizing
SXMB_ADM   
Integration Engine - Administration
SXI_CACHE   
XI Directory Cache
SXMB_MONI_BPE   
Process Engine - Monitoring
XI URLs
(<host> is the host name of the XI server and <sys#> is its system number)
http://<host>:5<sys#>00/rep   
Exchange Infrastructure Tools
http://<host>:5<sys#>00/sld   
System Landscape Directory
http://<host>:5<sys#>00/rwb   
Runtime Workbench
http://<host>:5<sys#>00/MessagingSystem   
Message Display Tool
http://<host>:5<sys#>00/mdt/amtServlet   
Adapter Monitor
http://<host>:5<sys#>00/exchangeProfile   
Exchange Infrastructure Profile
http://<host>:5<sys#>00/CPACache   
CPA Cache: Monitoring
http://<host>:5<sys#>00/CPACache/refresh?mode=delta   
Delta CPA cache refresh
http://<host>:5<sys#>00/CPACache/refresh?mode=full   
Full CPA cache refresh
ABAP transactions
SE38   
ABAP Editor
SE11   
ABAP Dictionary
ST22   
ABAP dump analysis
SPROXY   
ABAP Proxy Generation
SE80   
Object Navigator
ABAPDOCU   
ABAP Documentation and Examples
SE37   
ABAP Function Modules
SE24   
Class Builder
Administrative transactions
SM21   
Online System Log Analysis
SMQ1   
qRFC Monitor (Outbound Queue)
SMQ2   
qRFC Monitor (Inbound Queue)
RZ70   
SLD Administration
SM58   
Asynchronous RFC Error Log
SM59   
RFC Destinations (Display/Maintain)
SMICM   
ICM Monitor
IDoc transactions
WE60   
Documentation for IDoc types
BD87   
Status Monitor for ALE Messages
IDX1   
Port Maintenance in IDoc Adapter
IDX2   
Meta Data Overview in IDoc Adapter
WE05   
IDoc Lists
WE02   
Display IDoc
WE19   
Test tool
WE09   
Search for IDocs by Content
WE20   
Partner Profiles
WE21   
Port definition
Miscellaneous transactions
SE16   
Data Browser
SE93   
Maintain Transaction Codes
SM30   
Call View Maintenance
SU01   
User Maintenance
SM02   
System Messages