syntax of Power input line is similar to the search engine (Ctrl-F)
look thru the CATIA documentation, i.e search for "Using the Search Language"-string.
that will give you an idea of what you can do with the power-input-line.
I often use c: (c stands for command)
so "coint" is equivalent to pressing the point-button.
t stands for type, so tlane will select/highlight all planes in the part. if you perform "tlane & vis:visible,all" you will highlight only the visible planes in your part (or assembly... (HINT!)--this way you can quickly hide all the planes in your assy.)
f stands for favourite, so if you've saved a search query under a favourite, you can call on it using the f:"name" command
You will not be more productive simply using power input in this way. You have to assign shortcut keys to those commands used very often. Or even more quickly, create your own toolbar with macros combining (eventually) different commands.
A list with available commands in each workbench can be obtained from View pull-down menu - Commands List....or use next macro ( you can see how to create a macro with combination of simply commands simply adding line after line CATIA.StartCommand"name of command" ).
Sub CATMain()
Dim strCurWbench as String
strCurWbench = CATIA.GetWorkbenchID
MsgBox "Current Workbench is: " & strCurWbench & (Chr(10)) & (Chr(10)) & "Available internal commands for this workbench are listed in next window." & (Chr(10)) & (Chr(10)) & "Select desired command and follow instructions in lower left corner of CATIA window."