This is a script we got from someone that we are supposed to be able to modify and run. The tables are
supposed to be named the same and have the same structure, but I'm unfamiliar with SQL scripting and am
finding this difficult to figure out. If someone has the time, I would appreciate a blow-by-blow explanation
of what is going on here. For starters, what is "OSND" for?

Sorry for the formatting, but I'm not sure if that makes a difference so I left it as I received it.

Set NOCOUNT ON

Declare	@poscode as varchar(10),
			@posdesc as varchar(100),
			@acctno as varchar(20),
			@provcode as varchar(20),
			@PatientID as varchar(25),
			@ChartNumber as varchar(30),
			@Last_Name as varchar(30),
			@First_Name as varchar(30),
			@Middle_Initial as varchar(5),
			@Sex	as char(1),
			@DOB as char(10),
			@SSN as char(11),
			@ID as varchar(20),
			@LastName as varchar(30),
			@FirstName as varchar(30),
			@MiddleInitial as varchar(5),
			@Title as varchar(10),
			@Suffix as varchar(10),
			@UPIN as varchar(20),
			@Name as varchar(100),
			@LocID varchar(20),
			@DocDateTime as varchar(8),
			@DocumentName as varchar(80),
			@OldDocDateTime as varchar(22),
			@OldSubject as varchar(80),
			@Filename as varchar(50),
			@path as varchar(50),			
			@page as varchar(10),
			@documentid as varchar(40),
			@SQL as varchar(8000),
			@COPYSCRIPT as nvarchar(4000),
			@CREATEDIRSCRIPT as nvarchar(4000),
			@DELETEDIRSCRIPT as nvarchar(4000),
			@Folder as varchar(100),
			@Export_FileName as varchar(100),
			@Merge_Script as nvarchar(4000)

Set @poscode = 'OSND'
Set @Merge_Script = ''

Delete MedApps.analyzer_edg.dbo.OSND_ChartIDs
Delete MedApps.analyzer_edg.dbo.OSND_Appt_ChartIDs
Delete MedApps.analyzer_edg.dbo.A4XMLConversionCompleted

Insert Into MedApps.analyzer_edg.dbo.OSND_Appt_ChartIDs ( ChartID )
	Select Distinct Top 5 Acctno
		From MedApps.IDX_Data.dbo.Appointments
			Where POS_Code = @poscode

Insert Into MedApps.analyzer_edg.dbo.OSND_ChartIDs ( ChartID )
	Select Distinct (P.ChartID)
		From AllscriptsDB.Impact.dbo.Patients P
			Inner Join AllscriptsDB.Impact.dbo.Doc_Header H
				On H.PatientID = P.PatientID
			Where P.OrgID = '0'
			And	P.ChartID in (	Select ChartID
											From MedApps.analyzer_edg.dbo.OSND_Appt_ChartIDs )

While (Select Count(Processed) From MedApps.analyzer_edg.dbo.OSND_ChartIDs Where Processed = '0') > 0
	Begin

		Select Top 1 @Acctno = ChartID
			From MedApps.analyzer_edg.dbo.OSND_ChartIDs
				Where Processed = '0'

		Declare Patient cursor
				Forward_Only
				Read_Only
			For
				Select	Distinct  
							IsNull(convert(varchar(8),H.Date,112),'') As DocumentDate, 
							IsNull(H.DocumentName,''),
							IsNull(H.DocumentID,''),
							IsNull(FT.Description,'')
				From AllscriptsDB.Impact.dbo.Patients P
					Inner Join AllscriptsDB.Impact.dbo.Doc_Header H
						On H.PatientID = P.PatientID
					Inner Join AllscriptsDB.Impact.dbo.Folder_Template FT
						On H.FolderID = FT.FolderID
					Where P.ChartID = @acctno

		Open Patient
	
		Fetch Next
			From Patient
				Into	@DocDateTime,
						@DocumentName,
						@documentid,
						@Folder
	
		While @@Fetch_Status = 0
			Begin
				Declare Page Cursor
						Forward_Only
						Read_Only
					For
						Select	DD.Path,
									DD.FileName,
									DD.Page
							From AllscriptsDB.Impact.dbo.Doc_Detail DD
								Where DocumentId = @documentid
									Order By DD.FileName,
												DD.Page

				Open Page

				Fetch Next
					From Page
						Into	@path,
								@filename,
								@page

				While @@Fetch_Status = 0
					Begin

						If @Page = 1
							Begin
								Print	@acctno + 
										',' + 
										@Folder + 
										',' +
										@DocumentName + 
										',' +
										@DocDateTime + 
										',' + 
										@FileName

								Set @Export_FileName = @FileName
								
								Set @Merge_Script = '\\allscriptsscan\ImpactMDImages\' + @path + @filename + ','
							End
						If @Page <> 1
							Begin
								Set @Merge_Script = @Merge_Script + '\\allscriptsscan\ImpactMDImages\' + @path + @filename + ','
							End

						Fetch Next
							From Page
								Into	@path,
										@filename,
										@page
					End
					Close Page
				Deallocate Page

				Set @Merge_Script = Left(@Merge_Script,len(ltrim(rtrim(@Merge_Script))) -1)

				Set @Merge_Script = @Merge_Script + '|\\meddevstage\Export_Images\OSND|' + @Export_FileName

				Set @Merge_Script = 'C:\Tiff\Tiff_Merger.exe "' + @Merge_Script + '"'

				exec master.dbo.xp_cmdshell @Merge_Script, no_output

				Fetch Next
					From Patient
						Into	@DocDateTime,
								@DocumentName,
								@documentid,
								@Folder
	
			End
		Close Patient
		Deallocate Patient							

		Update MedApps.analyzer_edg.dbo.OSND_ChartIDs
			Set Processed = '1'
				Where ChartID = @AcctNo 
				And	Processed = '0'

	End

Set NOCOUNT OFF