What is PText in --->PCL1(tx)

hai all...

i am new to ABAP HR and i came to a program which tries to report any text maintained from PA30 (through F9). the code written is :- IMPORT ptext TO htext FROM DATABASE <b>pcl1(tx)</b> ID keys. i tried with other names for ptext but it didn't work...

my <u><b>question</b></u> is...

1. what is this text???

2. what is the use of this text???

3. what is <b>ptext</b>???

4. why only ptext works here??? ---> i came to know that PCL1 is a <u>Cluster Table</u>. but how can i find ptext from that table --- if ptext is a Data Element kind of thing in this table....

thanking you in advance...